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Topic: Carb help needed: engine stumbles
From: SC, USA
Registered: Nov 2002
posted 05-12-2003 10:46 PM
My car has been like this ever since the engine has been rebuilt and the new carb, new manifold, new...... I guess it just hasn't been adjusted right. Its a stock 289 with the following mods: bored .030 over, headers, performer intake, and holley 600cfm vac sec carb. I think its something with the jets or springs or pumps in the carb. Heres the problem: Say I pull the car out in the middle of a long straight road to do a burnout...I come to a complete stop with engine at idle...I stomp the pedal to the floor...the engine stumbles and possible cuts off if I dont let off a little, then picks up and goes. If I hold the brake and rev up to like 3000 and hold it, then punch it, the problem doesn't exist; only when I punch it real quick from real low RPMs. What could this be? It agrivates the crap outta me when I'm trying to do a burn out or take off real fast and the car cuts off or comes real close to it. PLEASE HELP. THANKS
'67 coupe: 289 bored .030 over, c-4 tranny
Holley 600 carb, edelbrock performer intake, hooker comp headers, dual flowmaster exhuast
From: Central Texas
Registered: May 2003
posted 05-13-2003 07:11 AM
Try a larger shooter first especially if its a single plane intake. Something on the order of #35. Then try a red cam on the accelerator linkage. Are you running a spacer under the carburetor? An open hole spacer will require more shooter than a four hole spacer. Then there's the jetting and the idle mixture screws of which either may be slightly on the lean side contributing to your hesitation problem.
This is assuming that you've already checked the accelerator pump linkage for proper travel and the float level is not set too low.
This is just a starting point. Ignition timing and curve is always a place to look also.
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