I have just finished fixing the oil filter housing leak and replacing the turbo oil feed and return line. I go to start it, it starts fine but has serious rough idle and CEL P0300, P0301, P0302, P0303, P0304. I have looked and checked everything I can think and everything thing seems to be fine. The MCS ran fine without any problems except the oil leak prior to now. I'm not completely sure I have the gasket on correctly that goes between the downtube to exhaust but I don't think that would cause this problem, but I could be wrong. Does anybody have an idea what could be causing this? Thanks ahead of time for any help.

 

I suppose you filled the oil and put coolant and bled the system?

erase the codes and see what pops back. if the same, then check the wring again and perhaps the ground strap on the motor mount and the little one on the valve cover.

 

did you mix up the thermostat and intake air temp sensor connectors?

 

Yes I did refill the oil and added more coolant along with bleeding. I cleared the codes and they came back. Went and checked all the connections and can' find one that isn' plugged in or crossed. Went ahead and changed tge plugs because it can't hurt and that didn't help. I'm at a loss.