Ok, I put a 1998 Hatch DX motor into my 93 EX coupe. I rewired all of the sensors, etc, and am running a 92-95 DX auto computer that was converted to manual. The car drives pretty good, but in order to get it to idle we had to move the cam one tooth advanced. It was a DOG from idle to 3500 rpm before we did this. Anyway, when I let it idle for a while to warm up, sometimes the check engine light comes on, and sometimes it comes on when I am cruising along, not really speeding up or slowing down, just holding my speed (30 mph in 4th). The computer flashes a code 43, which is fuel delivery problem or something like that. It goes away if you shut it off, but it is really annoying, and causes the car to be a dog again. Any suggestions? Thanks for the help. By the way, I am using a 98 dx exhaust manifold with the cat in it, but the o2 sensor I am using is before the cat.