Gentlemen, I have a '66 C10 250 w/2 spd auto PowerGlide and Rochester B carb, Delco dizzy/P&C. 65k miles.
I just did a tune-up. And I just rebuilt the carb. She has new: battery; wires; plugs; condenser; point; rotor; air filter; fuel filters; harmonic balancer; rebuilt carb; rebuilt tranny; new pcv; and fluids.
She has nearly new: timing gears; distributor; belts; muffler; and heavy gauge wires.
She starts up with 2 second push on button. She warms up fast. She runs very nice -very sweet. Good power. I have 16 inches of vacuum and proper fuel pressure. Exhaust color is good. All plugs firing and all valves dancing properly. A real cream puff.
Alas, out of nowhere, she suddenly has a blemish. Since doing the tune-up and rebuilding carb, when I brake, she bogs and stalls. The harder I brake, the quicker the stall. The easier I brake, the easier the stall. Forward or reverse. But not when in park or neutral. Only in drive and I have to move a couple inches. If I brake and give some gas, I can overcome the stall most of the time. I also have to have her idle set at around 900 to get her to idle smooth. I set her timing by ear and I think it is pretty good based on how she starts and runs. No amount of adjusting the idle and mixture seems to help. Oddly, after I drove her for an hour, the bog/stalling on braking seemed somewhat alleviated. It still happens, but not like it did initially.
Buddies are telling me to re-examine my carb, that there must be some grit in there. Others say to replace the carb. I took off the carb and had a quick look, and it seems perfectly clean to me, needle looks fine, etc., but today I will dismantle it and take it down to components and do a real deep cleaning again. I plugged the brake booster: no change. I see no loose wires, though suddenly my heater blower motor does not work.
Has anyone experienced this?
Last edited by Alden B.; 12/12/2014 3:40 PM.
