So for awhile now everytime I come to a stop or am driving very very slow foot on and off the brake my rpms drop below 800 and come back up causing the car to vibrate a lot. No cel have changed a lot. I changed all the intercooler hoses to silicone hoses and the problem went away for awhile and then came back. What do you suggest n80? I have a tiptronic b7 a4.
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