My neighbor has the same truck so I double checked all te wires. All are correct double checked plugs they are the right ones. Cleaned the egr valve and replaced the throttle position sensor still no change. I've tried everything on that list now except the manifold absolute pressure sensor and the iac valve. Someone old me it could be camshaft sensor or crankshaft sensor also? Wouldn't these sensors throw their own code other than the p0300 random misfire? So right now I know the coil and spark is good plugs and wires rotor and cap are good egr, tps, maf, and map sensors all okay. Fuel pump working new fuel filter. Good fuel pressure and good compression, no vacuum leaks and timing is correct with new timing chain. So my only possible options are the manifold absolute pressure sensor, cam sensor or crank sensor? I would think one of those would give off their own code. I apologize for long posts just trying to give as much info as possible
Thanks again for all the help.
Friday, November 25th, 2011 AT 4:06 AM