check your ground wires. make sure they are all really tight. also if you have a spare ecu check that out. i had a problem similar way back in the day of my 1st swap and my dumb a$$ didnt tighten the ground wireS all the way.

also if your car starts and idles but doesnt go past a certian rpm it could be the ecu stuck in dummy mode. usally a p28 in dummy mode wont go past 4400rpm