BrumTom_

When in neutral not depressing the accelerator pedal, I put my foot behind it and tried to pull towards me as you suggested, it did not move further towards me

I will definitely inspect the pipe tomorrow. With the accelerator pedal I've just done an embarrassingly short journey to the shops and back so engine didn't get particularly warm and so I didn't experience the rough idle but the throttle didn't move when I tried to pull it towards me. Maybe that's more likely the route of your problem @froggy8 as @Winosaid?

I haven't tried liftting up the throttle pedal, if I experience the rough idle again I shall try it and report back. I'm currently waiting to hear back from a skoda dealer and cloverdale parts re the brake servo vacuum hose. TPS just said they only deal with trade and couldn't help me. Cloverdale will comethrough with the win in the end if I had to guess at this stage.

Unless there's a massive obvious hole that I think you'd have noticed when taking the pictures I'm not sure that pictures of your engine bay can help people diagnose your problem (I may be wrong though as I am definitely a novice to all this). If it's the same issue as mine likely is then it'll be a crack or split in one of your vacuum hoses, you'll have to do what was recommended to me and visually inspect all of the hoses for wear/damage, probably starting with the ends of each section where they meet other components.

Cheers, there is a TPS super close to me, I'll give them a ring in the morning and see what they say. I'm thinking I might replace that before spending anymore time looking for a leak, that way if this is the culprit I won't have wasted any time and it definitely needs doing anyway. There might be another leak as well but I can hunt for that after I've repalced this if the problem persists.

Is there any recommended palces to buy repalcement parts like this?

Cheers, I'll peel off around the nonreutrn valve and replace with gaffer tomorrow then give it a bit of a motorway run to warm and see if it's fixed, if it is I will replace the hose soon when I am able to, if not, I'll do some more hunting around I guess. Replacing that hose soon definitely seems like a smart move. I assumed the tape was factory, it looked too well applied for a bodge but after some googling it is defininitely not factory. Cheers for all the help today and I'm sure I'll be back tomorrow, even if it's just to give an update that the non return valve is the leak and the problem has been found.

Yeah agreed, I assume this will probably need replacing sooner rather than later even if the current bodge job is still holding, so if it's not the problem might as well do it at the same time once I've identified the source of the current leak

Ok noted, that would explain it, I thought as it was all covered maybe it's supposed to be that way. I was wrong. I assume the previous owner also discovered it was leaking and this was their fix for it. How easy are these hoses to swap out myself/with a mate?

I have had a feel around the non-return valve (or atleast what I believe it to be and have circled in red) and cant feel anything when the car is running, I don't think I'd have expected to though tbh I will give it a run tomorrow to get the engine hot, when I do what should I do to test afterwards if the leak is there, I have read that spraying stuff onto the hoses and listening to hear if the revs change is a good idea, is that what you would recomend?

I have the 12v variant. Not sure if this was the only issue but it definintely wouldn't help the air leak situation, I would like to preface this by saying my more knowledgeable mate who was there at the time was responsible for swapping the airfilter whilst I was doing the pollen filter. The back left screw missed the mounting hole... This is now fixed.

Looks like it being rough when warm but fine when cold confirms your vacuum leak theory. I'll have a go at visually inspecting stuff myself and hope to identify the problem hose. If possible I would like to fix myself as I like projects like this and a car is a new playground for me, garage would be last resort if I can't fix it

Just been out to the car to change a bulb and checked the engine bay and ran it while I was there to see if I could hear anything. revs were sat quite happily at 900-1k and not going anywhere. The video in the original post was after a 120 mile motorway journey yesterday, is there something that would explain why it behaves that way when wamn but normally when cold? Cheers for that if it says MAP sensor I'll know what it means and will let garage know if it ends up at one

I changed the air filter when I got the car a couple of months ago and haven't touched it since, I'll check all the clips on the air filter pipes and the filter housing that I can identify to see if things weren't re-attached properly and have rattled loose, I also have an obd reader arriving tomorrow which might help confirm it's a vacuum leak. Thanks for the suggestion

I'm an engineer so I am somewhat technically minded but I'm realtively new to cars not having needed one until recently so although I can point at and name most of the engine bay I can admit trying to find a leak is outisde of my current abilities as I won't know which pipes and hoses are the likely culprits. I shall take it to a garage, thanks for you help

Ok, thanks for the help, I'm a new car owner so am not aware of all the correct terminology. How simple is something like that to fix? Sounds like a job I'm not going to be able to do by myself

Hi all, New member here, having bought an 08 petrol fabia a few months ago and it has now started doing this when idleing, likelihood of this being the mass air flow sensor or something more difficult/costly? Fabia_Idle.mp4 Cheers for any help.