Here's one for ya.... 1995 Ram 2500 4x4 with a 5.9L MPFI engine with 180K miles on it. Approx 500 mi on a complete tune up. Has had injectors cleaned and flow tested. Everything checks out fine. It was even smoke tested to look for vacuum leaks... Passed. The truck idles fine and performs fine under light acceleration. Under hard acceleration it will break the tires loose and run a hole in the wind. But under mid acceleration ( the amount normally used just shy of being enough to downshift) it starts cutting out and backfiring through the Intake.... Any ideas ???

make sure you spark plug wires are not near each other, fuel pressure, compression test and intake leak plenum test..

make sure you spark plug wires are not near each other, fuel pressure, compression test and intake leak plenum test..


Wire routing is exactly to factory specs, fp is midrange , comp is excell and even, intake has been smoke tested and passed with no leaks.... anymore suggestions ?

I've been hearing about gasoline with alky in it making one miss and turn on the Check Engine light....P0300, cylinder missfire/no particular cylinder.

Believe it or not it was all caused by a faulty O2 sensor....

Thanks for the update, will try to remember that.