I had this condidtion about a week ago as well as P0304 (cyl 4 misfire) and was told to clear the code and unplug/clean the sensor connector and check plugs, wire, ect. I cleaned connector and cleaned inside of wire boots and all was good. I cleaned intake/throttle body and sensors and got idiot light. Figured it was emissions code, so i took neg off again and let it sit for about 30min. Started and ran in driveway for a while with no check engine, then drove 5 min to get it scanned and got a P0606 internal memory error. I cleaned ECM connector. Even peeled back harness loom and visually checked for breaks or damage with nothing found. Hooked everything up and truck ran good with no check engine light. So never the less i drove to/for work with it (mobile gen tech). I get to work and my sub blows... ok, thats fine. gona go bigger anyway
Then when i start the truck to leave i get idiot light. got it scanned P0316 and P0304 again. bought/changed plugs on spot. No difference, but drove anyway because i had to do my service calls. Bought/installed a set of Bosh wires as soon as i got off. No difference. it only has a slight misfire that you can bearly notice. I only hear/feel it because there is no more sub
truck was sunk and had bad lifter tap that i mannaged to get to go away after it warms up. is it possible that i bent a valve and am getting blow by or inadequate pressure in the head causing a misfire? Im going to change sensor ASAP of course, i just have a feeling that the head has something wrong with it internally.
I would really like some opinions...