When it warms up pull the plug on the cold start valve and see if that helps. Make sure that the three brass adjusting screws are LIGHTLY seated. Make sure that at idle the idle micro is working,(test with a meter). Try never to twiddle the mixture screw, it is very sensitive and can only be properly set with an analyzer. Check all of the vacuum hoses for proper routing and brittleness. If they get hard they crack and leak and it is very hard to find. Make sure that you have a good seal on the plug over the mixture screw, an air leak there will screw up the air-fuel ratio. Do all of the simple stuff before you mess with the lambda circuit, if it is buzzing it is probably OK. David Teitelbaum vin 10757 --- In dmcnews@xxxx, Delorean17@xxxx wrote: > Hello list, > I finally got my engine back together after replacing the water pump > hoses and gaskets. My car has always ran rich since I bought it(only 15 > miles ago) > It smells like gas real bad when it runs and you can see a little smoke > coming from the exhaust. I tried tuning the 02 mixture screw back about 1/8