i forgot to also ask if it seems rich when warming up.... computer should be in open loop when warming up so that will keep the computer compensating for O2 readings.... notice that a vehicle always runs a little richer when warming up of course because of the choke... even fuel injected cars have a choke system yours would probably be an idle air control valve..... you should be newer than having the warmup injector (i forgot what they called that piece of crap)