Rochester one-barrel carb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dick's 67 · 07-24-2011, 10:21 PM

I have a '67 235HP with a 3-speed Chevy with 55k originals. Will post pics when I learn how. My problem is: While cruising at any speed, truck jerks. If you accelerate, let off, or pull choke out, jerking stops. Was told to back off idle mixture screw and if that corrects the jerking, the problem is in the power valve piston.
Backing off the screw helped the problem, so I stretched the piston spring from 1 5/8" to 1 11/16". That helped, but still can't find that happy place.
I've exhausted about all the info. I've received. Unless anybody has other suggestions, I would like to know if anybody has used CarburetorsandMore.com.
Thanks,
Dick

07-24-2011, 10:21 PM	#1
Dick's 67 Registered User Join Date: Nov 2006 Location: Fortville, IN Posts: 9	Rochester one-barrel carb I have a '67 235HP with a 3-speed Chevy with 55k originals. Will post pics when I learn how. My problem is: While cruising at any speed, truck jerks. If you accelerate, let off, or pull choke out, jerking stops. Was told to back off idle mixture screw and if that corrects the jerking, the problem is in the power valve piston. Backing off the screw helped the problem, so I stretched the piston spring from 1 5/8" to 1 11/16". That helped, but still can't find that happy place. I've exhausted about all the info. I've received. Unless anybody has other suggestions, I would like to know if anybody has used CarburetorsandMore.com. Thanks, Dick Last edited by Dick's 67; 07-24-2011 at 10:29 PM.

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