I keep getting multiple misfire codes at highway speeds and my truck is drinking the gas way more...
(More)
I keep getting multiple misfire codes at highway speeds and my truck is drinking the gas way more then normal. It seems to be running about 300 RPM's higher at highway speeds as well. I have changed the plugs and wires with no luck. I'm thinking it could be the coils. Any help would be appreciated. I have the 6.0.