My Skoda fabia 1.9 td vrs is having a blip on start up, a couple of months ago I changed the camshaft sensor to eradicate the problem of the car cutting out while driving (which it did) but I'm still left with the start up issue. Sometimes it will take 2-3 seconds of the key being turned to start up and then is usually followed by a dip in revs before the engine then comes back to life, all in a matter of seconds, I have changed the glow plugs but there is no change, any common faults people know about? Thanks

Could be diesel running back,so a slight leak somewhere.

My brother had this issue with his T5 van and it was the injector seals at fault