Hi guys, first time poster, long time reader & creeper
Here is the issue the dreaded p0300 random misfire no other codes on my 1999 Yukon SLT 5.7 vortec 156000m
Here is what I have done:
1. New cats 4 months ago; 4 new o2 sensors
2. New muffler
3. New wires, plugs, cap, rotor, coil...