Chopperpilot. Thanks. I haven't replaced the fuel filter yet. I did put a bottle of "Heet" in the fuel, along with 10 gal. of 93 octane, just in case of a moisture problem. Didn't make a difference. I'll change the fuel filter tomorrow and try again. Also, vehicle idles @ about 1250 RPM for maybe a minute or so, the will go to about 850 RPM. The idle fluctuates, but not necessarily for any given amount of time. Sometimes smells rich (not raw fuel, but exhaust rich), but no black smoke from the tailpipe. Thanks. David