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02 GTI 1.8t Rough/bouncing idle and stalls

3K views 6 replies 3 participants last post by  Mindfault 
#1 ·
My GTI has been running horrid the past couple of weeks. While the car is idling the RPMs jump randomly from 400-1200. And while I'm driving and push in the clutch for more than a couple seconds the car normally stalls. I was told it was the MAF but I replaced that today and it still has the same problem. Really starting to bug me and I'm running out of ideas as to what the problem might be. Any help would be GREATLY appreciated
 
#2 ·
Vacuum leak?
 
#4 ·
Check for pre-O2 exhaust leaks and try a throttle body adaptation. I had very similar issues. Car would take forever to start up, when it did, horrible idle, fluctuating RPM, backfires. Turns out my throttle body was bad. The butterfly would work perfectly fine with the ignition on, but when it was started, nothing.
 
#7 ·
Vacuum leak.
 
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