Alright everyone im looking for some help here! The thing that started this whole problem were codes p0171 and 0174. Lean for bank 1 and 2. This is on a 97 cobra. Had a ford dealer diagnose the problem and said it was leaking intake manifold gaskets. Ordered them up, installed them and.... still the same poor running and car performance!! As of now haven't gotten any codes! Symptoms: At idle spontaneously has a looping kind of chu chug, chu chug, affect. Revs smoothly sometimes and other times has hesitation and bogs down then will catch and rev. While driving has very poor acceleration poor throttle response. The pedal is pushed but its like there is a long delay car just bogs then will spuuter then catch and accelerate. Its an intermittent kind of problem. As of now plugs are new NGK TR5's gaped at .050, brand new coils, New TPS, new IAC, new MAF Sensor in a C&L Housing, and was told it has a new EGR as well but not sure. And of course the new intake manifold gaskets all of them. What could the problem be!! Dealer checked fuel pressure said that was fine. Bad injectors? camshaft sensor? what!! I need some type of input!! I appreciate it all!