my car out of nowhere started to fluctuate an idle between 400-700- adn shutt off...back and forth and has no power at all in order to drive rpms have to be up around 6000 and it still wants to bog down.. my mechanic found nothing took it to where they suggested and they found nothing I took it to ford.. and th diagnostics again came up fine.. and now they are telling me that in order for them to find out exactly whats wrong I need to put my stock air filter back on???? i have an open k&n it shouldnt make any difference at all??? any ideas what could be wrong since ford cant even tell???? anyone in flrida have a good mechanic??? please email me with any input.. HELP HELP HELP
