Originally Posted by Ryand2
Can anyone give me any suggestions?
1) It's always a good idea to give the year, make, model and other pertinent facts when asking technical questions. Without those, no one can give any vehicle specific info.
2) If this problem started immediately after work was done under the hood, then there's a very high probability that it is related to that work. Look around for disconnected or damaged electrical connectors or wiring, disconnected or damaged hoses.
3) The CEL is there to help with diagnosis. Finding out the trouble code(s) will point you toward the problem.
4) It is extremely
unlikely that the PCM could cause a single cylinder misfire.