What better place than here to find out what the problem is with my 440-six pack road runner. The car runs great at idle and with the pedal mashed. My problem is the idle runs 1000-1500 rpm higher than normal (900 rpm) after I make a pass, or hammer it on the street. I am running the stock set up with vacuum secondaries on a stock intake. Is the problem I'm describing what the electric selenoids are for on the original cars? Mine does not have them. Thanks, Tom

When it idles high have you physically tried to close each carb? Maybe one is hanging up. Overtightening the bases can cause this. Sometimes my carbs fall off but they never bind.

Thanks Tom. I haven't checked the base tightness. Usually I notice it when I drive on the street. I'm probably due for some new gaskets under the carbs anyway. I'll give it a try. I have not physically gotten out to see if or where they are hanging up. It's usually idling soo high that if i were to put it into park or neutral...it would rev pretty high. What were the solenoids used for on the originals?

i have fixed this problem several times. when the problem shows up,force the end carbs one at a time shut. if it slows down the problem is more likley the alunimun base bore is out of round.the best way i know to fix it is to sand paper the spot where the blade rubs on the bore.it may take several attempts

Make sure the linkages for the end carbs are doing their jobs. They are supposed to close the end carbs when the center is at idle. If there is any slack in them they may not be fully shutting the end carbs. Disconnect the end carb linkages and manually force the carbs closed. Then set the center carb idle. Reinstall and adjust the end carb linkage rods so that they solidly close the end carb butterflies.