Check Engine Light

UPDATE:

I took my car into a different garage recommended to me by a coworker. I didn't give them any diagnostic codes, I let them do that all on their own. I just told them all the issues I described above. I did not mention anything about the computer.

His diagnostic: I had a vacuum leak in the head gasket. Before doing any repairs, he called me and asked me to come in so he can show me the problem. The idle was running rough until he sprayed the carb cleaner where the leak was, and then it began to run smoothly. He fixed the leak, and the car was running smoothly.

HOWEVER, he also told me that the leak is not the only problem. According to his diagnostic, my second coil was also misfiring (the one I just had replaced, twice), but he did not want to fix it yet. He said that he wanted to take it step by step. In other words, if fixing the leak solved all the problems, he didn't want me to pay for unnecessary repairs, because the leak could be causing the coil to misfire. So he gave me my car back and told me that if the check engine light comes back on to bring it back in. My car was fine all day until I got home and the check engine light came back on. The idle is still smooth, and the RPM is no longer bouncing, so I'm going to assume it is back on due to the misfiring coil. I am taking it back in tomorrow morning.

Will post another update.

I'm going to change my upper and lower manifold gaskets ( possible air leak)anything else I should change while I'm down there? I have done plugs and coils. I think I recall someone mentioning o rings on the injectors but im not sure. Just trying to correct some check engine lights and the rough idle when cold. Seems to be common with these escapes any other places in particular I should be checking for vacuum leaks? It threw some codes but I lost the paper after I reset them 3 of them were p0300 p0171 and p0174. Witch is random misfire and banks 1&2 lean

I have replaced quite a few lines the erratic idle is so bad when its cold the car will not idle at all if you take your foot off the gas. I got the gaskets alrdy but I will check the lines again

It does not always go away. But it definitely gets better

Engine was preasure washed now its misfiring an check engine light is flashing an occasional shaking

Drying out coils won't always work. It will short them out so they don't work. I work on these frequently. Power washing coil on plug vehicles is a definate no no.