Jeffrizzzo
Newbie
My 98 305 with 122,000 miles is acting like the timing is off. I’ve replace the cam and crank sensor. Taken out the O2 sensors I’m front of the cats to offer back pressure relief in case they’re clogged. Plugs, wires, and cap and rotor all all about a month old with 2,000 miles on them. I lined up TDC on the balancer and the distributor rotor was pointing exactly at the mark on the distributor body (toward #1 cylinder). Pulled the distributor anyway to check the gear and it looks perfect. Lastly I’ve replaced the ECM because it’s the last thing I could think of and it’s not giving me any codes on the scanner. This thing went from perfectly running to backfiring out of the throttle body and I can’t figure it out. Perfect fuel pressure and beautiful spark. Please throw any ideas you have at me. I‘ve built engines and I’ve done an LS swap so I know a little about working on cars but, I guess I could still be missing something simple.