I have had some serious power loss and rough idling that set off check engine light (suprisingly, yours did not), and trans failsafe mode... i went from MAF to throttle body, even bought a fuel filter to replace, until i hooked up the INPA, and among of many other codes if mentioned misfire on cyl 5... i thought that misfire was secondary to other issues but nevertheless bought a brand new Bosch coil off ebay, replaced the coil and - voila!!! all the problems that i was having with loss of power, engine idling so rough that i thought it wanted to jump out... all was gone... i still have fuel filter on my to do list but the urgency has gone...