84 led lx 5.0 SEFI t5.
The car ran great before. After a year of rebuilding the rear end and transmission it has developed an intake backfire. It seems to bog down when you launch it from a dead stop, and when you are driving along in 2 or 3 gear and go full throttle you get intake back firing. According to what I have found on the internet it could be timing, bad O2 sensors, vacuum leaks or stuck exhaust valves. I Rechecked the timing, looked for vacuum leaks. I will run the codes to see if o2 sensors show up.
What is involved in checking the exhaust valves.