The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Help... Starting Problems, Rough Idle, and Backfire through Carburetor

1968SWBBigBlock · 10-26-2009, 09:33 AM

Look & listen for a vaccuum leak
Also check the timing - it really sounds like a timing issue - to far advanced
Also this would be a good time to replace the fuel filter
New set of plugs and wires, cap & rotor
Lastly if I read your post correctly you have HEI - if that is the case I would also replace the module that is located on the bottom side of the distributor - this seems to be the one minor weak link in the HEI system

10-26-2009, 09:33 AM	#2
1968SWBBigBlock Active Member Join Date: Oct 2006 Location: Ohio Posts: 1,643	Re: Help... Starting Problems, Rough Idle, and Backfire through Carburetor Look & listen for a vaccuum leak Also check the timing - it really sounds like a timing issue - to far advanced Also this would be a good time to replace the fuel filter New set of plugs and wires, cap & rotor Lastly if I read your post correctly you have HEI - if that is the case I would also replace the module that is located on the bottom side of the distributor - this seems to be the one minor weak link in the HEI system __________________ 1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles 18.5" x 31" Hoosier Pro Street Radials ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree