Please help running problem still

[matthg40]

Rite here goes when my 40 drops below 1000 revs it stalls I ve checked all earths and now I'm stuck I can do anything with my eyes closed on my polo but soon as it comes to electrics I'm stuck if anyone has pointers for me please suggest many thanks matt

[AlexG40]

Checked for vacuum leaks?

[matthg40]

Yes mate I've swapped everything over from my old polo to a  rolling shell do the engine came out in one piece so I'm still stuck lol

[matthg40]

I've. Checked vacuum leak throttle body all perfect pal

[matthg40]

I've just took my g out and notices that the headlights are flickering like mad is this linked

[AlexG40]

Could be, the voltage to the ECU is critical...

[matthg40]

Ah well I'm baffled then matey I dontnno what else to try

[cheys03]

It could be 1 of 1000 things.
In honesty, as you admit you're not experienced with electricals and electronics then I'd be tempted to take it to a well-know and recommended car diagnostician.

[matthg40]

Yer I was thinking that mate one last thing where is my isv as I have never cleaned it and touched it that could be part of the problem

[cheys03]

ISV is below the inlet manifold, bolted to the top of the water pipe that runs along the back of the block

[matthg40]

Awesome thank you for your help mate

[Peterpolo]

Also check your alternator charge rate and battery with a vm, the car will run crap if it's undercharging and that would proberly explain your lights flickering too!

[matthg40]

Any idea what the charge rate should be pal

[hayesey]

should get a good 13v or more across the battery terminals with engine running and everything electrical switched on, headlights, heater fan, rear window demister etc...

[matthg40]

Thank you for that mate will get the multimeter out later