HI, i also have a 99 2.8 and once had a rough start followed by an engine light. i took my a4 over to a local mechanic and was told it was a misfire code. he told me it could be something as simple as just a regular tune up on the car. he said mainly spark plugs and maybe wires.
you know all i did was had the engine code cleared at a local shop and they told me that if it happens again to take it in to get a tune up. did you check to see if the engine is getting enough fuel? is it only on start up?
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