I have a 93 civic with a b20b4 swap, Integra p75 cylinder head, intake manifold, engine harness obd1 and p75 unchipped ecu.

I bought this whole swap from a running and driving Integra, ever since I took it out of the donor car and installed it its been running poorly.

Runs very rich, smoke at startup, idles rough. Seems to idle a lot smoother as soon as it fully warms up and goes into closed loop. No fault codes. Car has full power but stumbles and hesitates in rpms a lot when not fully warmed up.

I've checked timing 3 times it is spot on, I've cleaned the injectors and replaced all the injector seals. The spark plugs are properly gapped at .045. New plugs and plug wires. Everything is connected. It had a top dead center sensor fault, I've replaced the distributor fault is now gone but still runs the same. Injectors and spark plug wiring is orientated correctly.

What could I be missing??

 

If it’s idling rough it could be the coolant isn’t bled properly. Other than that it could be a TPS or MAP sensor

 

its dumping fuel. will be trying a new map sensor. The tps works well i tested it with a multimeter and it gets the proper voltage based on load. I just replaced the fuel pump and injectors since my crankcase is filling with fuel.