ok guys I have a 2004 Honda civic ex I think she has 250K on her when I bought the car I had head gasket work (done right everything you do when you bother to do a head gasket) I drove the car for several thousand miles car ran great now I have an engine light on code points to a transmission solenoid I understand there are two one costing 249$ and one 50$ does anybody know how to tell for sure witch one is the issue? the car has also developed a low rpm engine idle mis. When driving I do not notice an issue but when stopping the engine will miss below 700rpm seems like the engine is trying to idle at 500 rpm. Any suggestions