Need some help. This may be a long post as I have several problems so please indulge me. Tried to search for this but no luck you may understand after reading this. I have a 1990 Honda ex...the engine and transmission (k clip I believe it is called) was swapped at 225k and I am not sure if it was a 1990 replacement or not so (anyway to tell?) here goes... (1) the car starts cold goes to fast idle ok but when it warms up and drops to a slower idle it hunts for a time then slows down, also when driving it will not return to slow idle until I put it in neutral for several seconds and then it will idle down until the next stop light and I have to go through the same routine again. (2)got 3 codes out of it. 1,41,43. Installed new plugs and checked air cleaner, it has a cold air intake on it and it was plugged! so I cleaned it good . I cleared the codes and drove it. Problem 1 still there but only set code 43 (fuel delivery) this time. Ran good until it set code then it will not up shift until I rev it up or floor it (shifts poorly...this has happened before too)??? As you can see I think this is more than 1 problem. TIA