Search Results for ‘backfire’

Okay, so I'm thinking I have a broken valve or something because the timing is steady (with a light). It will run smooth for a spell, then start back firing pretty bad, stalling, then it will smooth out again. Any heads up suggestions before I tear into it?

95 YJ 4.0L 5 Spd. let's start the list replaced already: TP sensor O2 sensor crank position sensor idle air controller map sensor plugs, wire, cap, rotor coil & 2 wires going to coil from ecm timing good excellent fuel pressure, compression & spark readings fuel pump fuel filter no fault...