i have a 2000 audi a4 1.8tq manual. atw motor. (casablanca on black). when i star the car cold it idles for a second fine and then it sounds like it backfiring or misfiring almost. but as soon as secondary air pump turns off it goes away or if i turn it off and turn it back on it wont do it. i unplugged the secondary and it still did it, i put green top sensor, have hitachi coil packs, did a full tune up and cant figure it out, can anyone help me out please.. any idea will help
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