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Discussion Starter · #1 · (Edited)
My RPM needle keeps bouncing when im coasting downhill. I'm assuming it might be a vac leak. I have a TIP and elbow charge pipe waiting to be installed as soon as the morning freeze over stops. Don't know if that'll stop the problem. If it is a vac leak where do I start; there's like a million freakin lines on it.

2000 GTI GLS
 

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My RPM needle keeps bouncing when im coasting downhill.
I assume your tach response is damped, probably 'critically damped' and therefore if you have an electronic tach I'd say it's a bad connection and your RPM is not actually changing that fast.
But, a bad connection should also happen when you're not coasting. :confused:

What does the engine sound tell you?
 
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