Is there anything that controls the intake below 3k rpms? I've been having this problem where it just stutters within 0-3000 rpms and once it hits 3k rpms it revs fine. It also stalls a few times when its cold and when its really really hot like after 30 mins of driving

 

Is your timing okay?

Any check engine light?

--Gary

 

i get a check engine light like once a every few days for about 10 seconds then it shuts off

 

The only thing that controls the throttle is your right foot. Sounds more like a sensor problem, possible the AFM or coolant thermosensor.

 

Mine had a similar problem, after I removed the throttle to clean and explore. I was thinking it was the BAC, cause it was clicking and revving up and down. Then I realized that I never plugged the TPS sensor back in......(save your comments). Works fine now.

 

The code that engine light is throwing would be a big hint... pull the codes:

http://www.1300cc.com/howto/how2/codes.html

In an S5 like mine it's very easy... just ground the test wire to the metal bracket that holds up the fuse box in the engine bay.

--Gary