Hey can anyone give me a clue

I got in my car and it was running fine and then all of a sudden when i step on the gas even in the slightest bit it starts jerking and shaking but still accelerates and then my check engine light flashes for about 30 seconds and goes away then it came back because I continued to drive ... i read that it could be a misfire or a coil pack ... I have a giac race fuel program upgrade on my ecu and was wondering if that coudl have anything to do with the problem or if the effect of more fuel being pumped into the engine (what the chip does) maybe was too much stress for a cylinder or something and caused the damage ... anyone ... HELP!

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2008 Tahoe LTZ blk on blk
Parrot handsfree bluetooth / GM Lockpick NAV hack module / xenon headlights / smoked tail lights / 20% tint all around / painted black badges / HID fogs

1800watt MTX amp
12'' MTX Sledgehammer Sub
Used to have:
2002 a6 2.7t s-line / GIAC / REMUS / AWE-Tuning s-flo intake / Forge splitter DVs / vast stage 3 tip chip /vast piggies / obx manifolds / samco tbb / 19''x8'' MMR wheels

Your car is missfiring. Get the codes pulled and post them on here and someone should be able to tell you what is wrong. I wouldnt drive it much with a flashing CEL or you could damage the cat. converters.

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2000 Audi A6 2.7t
6 speed

A few other cars not worth mentioning

thats what ive been reading ill get the codes and put them on here thanks for ur help check back in a few days for the codes please thanks so much

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2008 Tahoe LTZ blk on blk
Parrot handsfree bluetooth / GM Lockpick NAV hack module / xenon headlights / smoked tail lights / 20% tint all around / painted black badges / HID fogs

1800watt MTX amp
12'' MTX Sledgehammer Sub
Used to have:
2002 a6 2.7t s-line / GIAC / REMUS / AWE-Tuning s-flo intake / Forge splitter DVs / vast stage 3 tip chip /vast piggies / obx manifolds / samco tbb / 19''x8'' MMR wheels

sounds like a coil pack or severalbut without codes it could be something else.
Coil packs are covered under warrant if you have one. DOUBT it has anything to do with the chip

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2004 A6 Stg 2+ and 99 TJ...mod

I had the same problem; went to the dealer and they told me the problem was with the coils. Had them replaced. Cost 400 bucks.

I would concur, the feeling you describe could only be a misfire or something like a clutch slipping, but you wouldn't get an engine light for the clutch. It has to a misfire. I had an Alfa Romeo Milano that had the same thing and it actually turned out the be a failed spark plug wire (the one from the coil to the distributor) it was shorting to the body of the car and causing it to stutter as you describe.

-Pizza

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2000 Audi A6 Quattro 2.7T 6-speed Manual