Wierd idle! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sjarrett71 · 12-04-2010, 10:20 AM

When my truck is cold it idles fine, between 700-800 rpm's. After the truck is warm and driven, the idle speeds up to about 1000-1100 rpms. The key is it has to be driven for the rpm's to kick up. If I just let it idle to warm up the rpm's stay fine. It's a 350/4 speed with a Holley 650 mechanic choke, nothing but the fuel line, choke cable, and linkage are attached to the carb. I don't use the choke when it's cold, I just feather it until it runs. Does it soulnd like a carb issue or a timing issue?

12-04-2010, 10:20 AM	#1
sjarrett71 Registered User Join Date: Dec 2006 Location: Rolla, MO Posts: 2,463	Wierd idle! When my truck is cold it idles fine, between 700-800 rpm's. After the truck is warm and driven, the idle speeds up to about 1000-1100 rpms. The key is it has to be driven for the rpm's to kick up. If I just let it idle to warm up the rpm's stay fine. It's a 350/4 speed with a Holley 650 mechanic choke, nothing but the fuel line, choke cable, and linkage are attached to the carb. I don't use the choke when it's cold, I just feather it until it runs. Does it soulnd like a carb issue or a timing issue? __________________ -Scott-

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