Hey guys quick question. So I have a 2009 Audi A4 and recently I had been noticing some pretty intense sputtering upon acceleration. I did a ton of research and found out it could have been the spark plugs. So I replaced the spark plugs and that was just last month, the car still sputters upon acceleration some people say it could be the coil packs, other people say it could be the signs of a fuel pump going out. Please help me clear this up!