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I have a 1991 Chevy 1500 2wd ext cab truck that is a bi-uel setup all of my equipment is made by impco I have a Impco 3600 HPR that leads to a shutoff solenoid that goes to the Impco Model E regulator. that goes through a 1In. hose into the Impco mixer. I can't get this truck to stay running at idle. i have checked all of the gaskets and seals and all the bolts and electrical connections. i have checked the shutoff solenoid and it is still good. it was running fine yesterday and now today i can't bring it down below 2000 rpm or it will die. any help or suggestions would be great.