Hey guys, i just picked up a used 2009 a4 quattro with 90k on it. When I go moderate to full throttle, the car bucks hard and feels like the engine is cutting power almost. I am having some trouble diagnosing this, could it be bad gas (dealer put regular in) bad coils? Dirty fuel system? Or a problem with the turbo. I don't have any check engine codes when this happens so the car clearly is pulling power for protection of some sort, unless im mistaking it being the engine and its actually along the driveline, but the car drives fine otherwise, and you can slowly vary the throttle until its starts to shudder lightly and then worse as you go harder on the gas. Doesnt seem to be speed related at all. Just looking for some input on where to look. Ordered a set of R8 red top coils and gonna replace all 4 just for shits and giggles and soon as I go through this dealer gas, gonna fill up with premium at shell or sunoco.
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Originally Posted by giuseppi
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