I have 2002 audit quattro TT with 180k miles. When I do a normal acceleration the car surges and rpm drop but pick back up. If I accel hard it runs fine. Also at idle at times it varies 200 rpm like a rough idle but will then smooth out for a few sec then idle rough again. I don't get any check engine lights but a few months ago had the eps light come on and only go 20mph. Did that 4-5 times over a week and hasn't done it for 4 months. Shut car of and restart would clear it. Thanks for any help.
This sounds similar to a problem i had.
as the rpm went over 2000 the engine would stop for a split second and then kick back in.
after a few days looking my garage finally found the problem was a faulty air mass meter.
this cost me £200 in total to be repaired.
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when the car is running every so often the car becomes rough for a few seconds, it more noticeable when acceleration is added
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