Driver says at higher gears 7+ during shift he will hear a pop/backfire. This is every now and then not all the time and coming out exhaust.
Other issue is its losing power and losing pedal response but for a second then back to normal.
Truck idles good drives good just messes up when the popping occurs.
Work thats been done.
New ECM old one quiet
New engine wiring harness
New engine position sensor
Before emc/harness replacement check fluid light would come on then stop engine then shut done for a second.
Replacing TPS today to see if that helps pedal/power loss.