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when i get stuck in stop and go traffic for a while, my car begins to cough and sputter on partial throttle... it is fine on acceleration and deceleration, it only has problems like when i'm cruising...
My sister's car has a similar problem, and we tried replacing the cap, rotor, plugs, and wires, all oem, no platinum, properly gapped, and it didn't solve the problem. When we hooked it up to vag-com, the timing advance randomly dropped, seemingly causing the misfire... i don't know for sure if the advance was causing the misfire, or the misfire was causing the drop in advance... any ideas anyone? My dad is a long time VW Mechanic, and he is at a loss...
 
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