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[Andy89]

Would it take much to alter them?

What do you mean?

Alter them to miss the steering and the auto box...?

I'm not really shure, but i guess the exhaust wil hit the "cluch housing" on the auto, it looks bigger, and the oil cooling lines.
I will check into the steering when i get the time.

[SteveT528]

I would replace the idle valve with a known working one, ive had this problem before erratic idle and cutting out/jumping while driving mine was more noticable while on full throttle it would jump or die for a few seconds.  very rare for an idle valve to cut an engines power while driving as its not used while up in the revs. but it happens.

3.2 injectors if i remember right dont flow as much fuel as 3.0 injectors so not a good upgrade. but a 3.8-4.0 bar fuel pressure regulator may help.

with a set of headers you really need to get a mappable chip fitted and get it on the rollers.

have fun 

[Andy89]

Tried changing the idle valve with no help, afraid it might be the ECU.

[serek]

I'm having some problems with mine, and wonder if anyone else has the same, or if it works well.
I am running the original ECU.

know 2 people who have them fitted and they don't have any issue with out remap or chip car
Have look your lambda sensor maybe they play

[feeutfo]

I'm having some problems with mine, and wonder if anyone else has the same, or if it works well.
I am running the original ECU.

know 2 people who have them fitted and they don't have any issue with out remap or chip car
Have look your lambda sensor maybe they play

Interesting and noted. Some diagnostics then...?

[Kevin Wood]

What else was changed / disturbed on the car when the headers were fitted?

As long as they are airtight they won't cause a serious running issue and won't need a remap to get it running acceptably, IMHO, so look for things that might have been disturbed in the process.

What has happened to the EGR? Blanked off with no leaks? Is the rest of the induction system OK? Throttle body and pot OK and original? Throttle closing fully and not tweaked using the stop screw? I have heard of similar symptoms when the throttle body and TPS didn't match the vehicle loom... If the plenum has been changed for a long one, for example.

Does it stop if you pinch the rubber hose into the ICV? If not, the air is getting in somewhere else.

Can you post some live data from it?