How did you "adjust" the mixture screw? It can only be correctly done with an exhaust gas anylizer. My guess is that is is set too rich. Try turning it 1/8 turn and check the spark plugs to see if it is leaning out. The adjustment is VERY sensitive. If it is not close the O2 sensor and the Lambda system won't function properly as the mixture is too far out of range. The lambda is only capable of a small range above and below the ideal setpoint. Around here people don't idle their cars for 2-3 hours. Any vacuum leaks will keep you from getting it right so make sure there are no leaks. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "Stragand, Dave" <dave.stragand@xxxx> wrote: > Hi All, > I've made a bit of headway with my idling problem. Berryman's ChemTool B-12 has helped to smooth things out a bit, as well as replacing the o-ring seal under the fuel distributor and adjusting the idle mixture.