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Bouncing Rev Needle at Operating Temp


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Just looking for some thoughts on this. So the car drives fine except for a few seconds when the car reaches operating temperature. Essentially for a few seconds, like this morning when I was driving along in 4th doing 30mph, the throttle was depressed only slightly and the rev counter needle was bouncing up and down (at this point the exhaust note changes, it is much rougher). It was doing this before my re-map (which has made this issue slightly better) but I'm just wondering what exactly this issue is. Abbey & TDI claim to be able to fix such stutter, but I'm just wondering what exactly this would be and if there's anything I should try before I contact TDI again to ask them for more information on what it might be.

 

'57 plate HR btw ...

 

Thanks all!

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