B-20 in 1991 Integra HELP

I have a 91 integra with a b20 swap. I used the stock intake manifold to be able to use the OBD-2 B20 in my OBD-0 car. It feels very sluggish and I have to push down hard on the gas to get her to normal speed. I tried turning the distributor every way but it doesn't make any change. The car ran perfect once right after I did the swap, I had it in diagnostics mode because a friend told me that the ECU won't try to automatically fix the problem of there being a totally different motor, that is the only time the car ever ran normal. Someone also suggested i get an APEXI SFAC to be able to see and cure the problem if it was caused by the air fuel ratio?????? Is the ECU the issue?????? Any help or suggestion would be greatly apprciated.

check throttle cable.

daignostics mode = check engine light?

pull the CEL.

The throttle cable is adjusted tight, the check engine light has been on since I put the motor in, what is the CEL???