part throttle stumble? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tom · 07-21-2004, 06:49 PM

My engine has a stumble under part throttle when it gets hot around here and I can't tell why. Its been tuned correctly and the plugs look good, also my a/f gauge says the ratio is good.
The only time it acts up is when going from a stop and you just get on the gas, it stumbles. Once your going theres no problem, and if you start from a stop and give it a good amount of pedal then theres no problem. Any ideas?

MSL · 07-21-2004, 08:55 PM

what kind of carb do you have.

Tom · 07-21-2004, 10:25 PM

Its a carter 600cfm with no choke. It has a HEI with 14* initial hooked up to ported vaccum.

PHOENIX · 07-22-2004, 01:07 PM

Tom, are you running an egr on that engine?

Tom · 07-22-2004, 03:32 PM

no egr

07-21-2004, 06:49 PM	#1
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	part throttle stumble? My engine has a stumble under part throttle when it gets hot around here and I can't tell why. Its been tuned correctly and the plugs look good, also my a/f gauge says the ratio is good. The only time it acts up is when going from a stop and you just get on the gas, it stumbles. Once your going theres no problem, and if you start from a stop and give it a good amount of pedal then theres no problem. Any ideas? __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

07-21-2004, 10:25 PM	#3
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	Its a carter 600cfm with no choke. It has a HEI with 14* initial hooked up to ported vaccum. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

07-22-2004, 01:07 PM	#4
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Tom, are you running an egr on that engine? __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

07-21-2004, 08:55 PM	#2
MSL Registered User Join Date: Mar 2003 Location: So.Oregon Posts: 765	what kind of carb do you have.

07-22-2004, 03:32 PM	#5
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	no egr



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