1989 Dodge Diplomat sputtering and stalling in gear

1989 Dodge Diplomat V8

replaced the ECM, had the carb rebuilt, oil change, new pin in distributor, for some reason the mechanic didn't give it a full tune up, he only changed the plugs. I can get the car to run now at a normal idle in park, but if you put it in gear it sputters and stalls. Driving is worse it acts likes it's getting too much fuel. Any suggestions are appreciated