Originally Posted by olecountryjohn89
you have a misfire check and make sure you have the plug wires on correctly
I've checked and re-checked.
It has codes P0054 HO2S heater resistance (bank 1, Sensor 2), P0300 Random misfire, P0303 CYL #3 Misfire, & P0316 Misfire in the first 1000 revolutions. The truck has an off-road Y pipe on it and I'm considering installing a free flow cat to take that out of the equation. I worked for a Ford dealer a few years back and the service dep. wont even look at a modified veh. for diagnostic.