Need an engine guru - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Solver · 05-03-2004, 08:58 AM

got thee longhorn ready to fire up. older 350,hei- new plugs,wires,cap,rotor.
Bought a rebuilt quadrajet at parts store. I have a surging problem just coming off idle.Highway speeds seem ok. Idle is kinda crappy also. It runs better when I leave a vacuum port open (ie no hose on carb port)seems to smooth out somewhat.The vacuum thing is probably my biggest clue to problem. The idle mixture screws don't seem to have any affect on vacuum at all. They really don't even seem to affect the engine speed. I am thinking its a bad carb thats why all carb info.
Whats your ideas?

05-03-2004, 08:58 AM	#1
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	Need an engine guru got thee longhorn ready to fire up. older 350,hei- new plugs,wires,cap,rotor. Bought a rebuilt quadrajet at parts store. I have a surging problem just coming off idle.Highway speeds seem ok. Idle is kinda crappy also. It runs better when I leave a vacuum port open (ie no hose on carb port)seems to smooth out somewhat.The vacuum thing is probably my biggest clue to problem. The idle mixture screws don't seem to have any affect on vacuum at all. They really don't even seem to affect the engine speed. I am thinking its a bad carb thats why all carb info. Whats your ideas? __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon



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