Please help me!!!!!!
Background: 1999 Mazda B3000 Troy Lee Designs 174,000 miles.
Bought the truck in August of 2011 with a cylinder 5 misfire. Replaced the head due to the valve seat being shot. While I was at it I replaced all spark plugs, plug wires, coil pack, iacv, pcv valve, egr valve, egr valve pressure sensor, #5 fuel injector.
Truck has ran fine since august until a week ago. Truck began throwing and idle air overspeed code. Replaced iacv (again), tps sensor, coolant temp sensor, and camshaft position sensor. No more overspeed code.
A couple of days later i get a code for Cyl 5 misfire. Pull the plug and the electrode is all but gone and the plug is caked with carbon and the ground is powdery white. Pulled another plug out of #6 ground was a little white but the electrode was fine. Put a new plug in hole #5. The truck ran fine for two days until today. Got the cyl 5 misfire again. Pulled the plug. The color wasnt bad but the electrode was slightly bent. Any ideas?????