stumble on acceleration - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 05-10-2007, 02:01 AM

i just aquired a 78 cheyy van that i could barley get home due to a shot accelorator pump (qjet). i rebuilt the carb and there is a day and night difference in performance. the only thing is that there is a stumble on acceloration. i have rebuilt 9 qjets successfully and everything in this one was fully referbished. the motor is all factory and i set the timing to 8 degrees. if i punch it from a stop, it misfires and falls on its face. if i feather it slightly and then give it juice, it has great power. what might cause this stumble?

05-10-2007, 02:01 AM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	stumble on acceleration i just aquired a 78 cheyy van that i could barley get home due to a shot accelorator pump (qjet). i rebuilt the carb and there is a day and night difference in performance. the only thing is that there is a stumble on acceloration. i have rebuilt 9 qjets successfully and everything in this one was fully referbished. the motor is all factory and i set the timing to 8 degrees. if i punch it from a stop, it misfires and falls on its face. if i feather it slightly and then give it juice, it has great power. what might cause this stumble? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies



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