Cylinder 4 misfire

[darrinswait]

So I put in a new ECU/IAC....2000 I30t....and finally got the car to start. But now I'm getting 2 codes. One is PO1320, and the other says that cylinder #4 is misfiring. I replaced the coil...same code, still has misfire. I swapped coils between cylinders 1 and 3 to see if maybe the coil was bad, and reader still says cylinder 4 has misfire. I put on a new harmonic balancer and I read somewhere that the crankshaft sensor could cause this error, so I'm going to check that. Otherwise, what else should I be looking at?

NOTE: I have yet to re-learn the ECU/IAC/TPS since getting it to start. Could this be the reason that it's not running right?

Thanks,

Darrin