I have a 1995 Accord with a JDM H22A swapped. Long story short, the car was running a Civic ECU when I bought it, no CEL just **** gas milage and runs rich. I put the H22 ECU in there and thats where the fun began:

Throwing codes 1, 9, 12. and 21

I replaced the O2 Sensor already and still throwing the code, as for 9 do I need a JBM distributer?, the car has always thrown 12 with H22 ECU, and I dont get why I am throwing 21 cause VTEC works.

runs fine for a while, then the CEL comes on, and all power (speed) is lost. The temp gauge indiactes that is is overheating, but I think that is the themostat sticking or something becuase the car is not running that hot, and is unrealted to these codes.

Please understand, I don't really know about Hondas, I saw this as a good project car, but it has been a nightmare ever since I bought it. Any help wopuld be very appreciated.