I have a 2002 V6 mustang nothing done to it exept a little chip tune from a sct hand held tunner. i recently replaced my air filter with a k&n and changed my oil with full synthetic oil. the first day i had the k&n filter on the car it ran perfect but the second day i ran it, it started to loose alot of power and now its misfiring when i go up hills, if i have it in nuetral and press on the gas its like its bogging down and hesitating. i read that i could have been the mass air flow sensor so i cleaned that and its still happening. if anyone has any ideas on what could be giving me these problems any help would be appriciated.

 

no check engine light or trouble codes? did you try putting your stock tune back in? maybe some sensor got unplugged while doing the filter. did you take the plastic wrap off the filter? ( i know, dumb question, but look at the obvious things first)

 

The K&N doesn't make a noticible difference to cause any porblems with your year car. Your problem likely lies with the ignition system or while installing everything you knocked a vacuum line loose which deffinitely will cause that kind of problem.

 

please keep us posted as to what you find wrong..