I know this has been covered before, but I can't sort this one out.
My idle has become really erratic (revs up and down) to the point where is sometimes stalls at the lights. I've run 2 cans of upper engine clean, removed and manually cleaned the idle valve, and also done an ECU reset but it's still the same. I have run the tank right down and refilled it with a full tank of ultimate and put in a bottle of octane booster but it's no better. Occasionally it will idle fine, but most times it's like "bruuuuum, bruuuuum, bruuuuum"

I don't know what else to try without spending loads of money trying parts.

Any ideas????
Do idle valves play up on the GC8????

The car drives fine it's just the idle.......

SC TER

Afm

Wouldn't the afm cause rough running (eg driving not just idling)??????

yea, i had that and it happens to be the afm

which ECU?

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God is punishing me for all my past sins.

Ok will try that... If it's buggered what are they roughly worth, and where is the best place to get one from????

Idle air control valve. Clean it! Problem Solved! Cost: $0

my mates is doing the same thing at the momment.. he is due in for retune at Race torque soon so he is going to get it checked. saying that he has no touble codes at all.
and drives well expcet for the idel prob..

Sorry for noob question but where is this located and how do you clean it?

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M POWER

Factory....