Injector problems on Skoda 1600 diesel

[BigBry]

I diagnosed and it said number 1 injector is faulty. 
i replaced this. 
Ran ok for 10 mins. 
Turned car off. 
then when i started the car again it was back to running rough. 
diagnosed again and this time it said number 4 injector ???

I replaced  that. 
restarted car….. running ok. 
went for short drive. 
turned car off and on again and was back to running rough ???

any ideas on how I can resolve this. 
 

[EnterName]

Is your fuel contaminated?

[BigBry]

I was thinking that. 
I will check that today. 
thank you. 

[EnterName]

2 hours ago, BigBry said:

I was thinking that. 
I will check that today. 
thank you. 

No worries, let us know how you get on.

With that in mind, might be worth checking the fuel filter too.

Also, and bear in mind I'm not a mechanic, there's a possibility that some sort of air leak might be causing you problems, so if your fuel and filter are fine, that might be something to look into.

(Either air leaking in or out.) Can't explain why, but a memory has been triggered.

Might be worth having a search around on Brisky for issues with rough running and air ingress/leaking.