at 4000 to 5000rpms the trans is not upshifting if you are at wide open throttle. trans shifts fine any other time. also throwing mass air circuit code. changed maf sensor still throwing code. please help.
Check the tps to see if it's reading correctly. Try cleaning the throttle body as well. I also think there may have been a tsb(tech service bulletin) for MAF wire harness problems. Try searching around about that and check with your dealer.
69 Z28 Hugger Orange original factory JL8 brakes, being restored
Gotta get in in and gotta get it out.Swapping out the maf sensor is half of the equation..you still have to get it out.Hammer a potato into your tailpipe and see how happy your maf sensor is.I would not rule out restricted exhaust ie cat converter fail.
8-71 blown 461 Rat on E-85