I have a 1998 Chev. K1500 (4x4) 5.7L with 111,000mi.
My problem(s) started with a P0300 ODBII code (Random Missfire). I have not been able to retrieve any P030X for specific cylinders. The second problem is while driving at a steady speed mainly above 60mph the rpms will climb about 200-400 rpms above normal. I have had the TCC valve replaced, selinoids, and a new torque converter. As far as the missfire corrections that I have made are new plugs, wires, ignition coil, cap/rotor, EGR valve, temp sensor, thermostat, CPS, TPS, Have had fuel system flushed/cleaned numerous times. The exhaust seems to be normal, no excessive oil conumption, and all other fluids and lubricants are at normal levels and have been recently changed or serviced. I am assuming that this missfire is causing the vehicle to think that it needs a richer fuel or that it is underload telling the transmission to not allow the torque converter to lock out. My engine warmss up pretty fast but and operating temp is about 3 lines below 210 degree mark on the temp gage. Could you please give me some suggestions?
Friday, December 15th, 2006 AT 4:57 PM