Misfiring - modified 3b engine - help please

[Vilhelm]

I have an Audi 100 Quattro 86 with a 3B block (some internal mods done - don't know the exact mods done to the internals though) Turbonetics T3/4 turbo, RS2 top, exhaust manifold (Don't know the brand), Custom IC made at FMS, tuned at FMS. 3,5" downpipe, 3" exhaust. That sum's it up. 360 HP.

I got the car a week ago, I am very happy with it. But now when I drive it (it's getting cold here) it starts misfiring around 4-4.5k, after the boost has been on for a little while. When it's about to really move it starts, fast (like on a rev limiter - but softer),and it doesn't accelerate all that good.

What could this be? I filled her all the way up 30 km ago.

Thanks in advance,
Vilhelm

[SteveH]

Did you fill up on the same grade of fuel the car was tuned on? May be poor fuel causing the problem, if not get your tuning checked.

[caterpillar]

dead petrolpump i think, or to small injektors

[Vilhelm]

Did you fill up on the same grade of fuel the car was tuned on? May be poor fuel causing the problem, if not get your tuning checked.

I put on some 99 instead of 98, but that shouldn't do anything to it, should it?

I was thinking it might be the spark plugs, because it gets going again after misfiring for a little.

[Vilhelm]

It was the dynamo. Thanks for the help guys