1979 Chevy Camaro Car runs weak under load

WALSH4ND89

MEMBER
1979 CHEVROLET CAMARO
V8
2WD
AUTOMATIC
180,000 MILES

I have a 79 camaro with a 305. After buying the car I replaced the cap, rotor, coil, plugs, and wires as a little tune up. In park and in neutral the car runs great and the secondaries on the carb open up nicely and it sounds powerful. When I put it in gear and punch it or give it gas at it seems weak and very unresponsive to the throttle. With the car on the road I have never heard the secondaries open like they do when I rev it in park or neutral. Under a load they just barely try to open. I thought it might be the vacuum advance so I replaced that piece. It seemed to run even better in park when I replaced it, but just the same under a load. The carburetor is 6 year old rebuild Quadrajet based on the remanufacting sticker from 2002. Where should I go from here? Thanks

2 Replies

JOHNYPHANTOM

MEMBER
37 POSTS

There are a few things I would try, first make sure that your timing is correct, make sure that your counterweight springs in distributor are not worn out, make sure vacuum advance vacuum hose is connected to a vacuum port on carb that only pulls vacuum under throttle. Theres a few things that could cause this so it might be hit and miss to find the solution, if all else fails try putting a holley 600 cfm carb on it, anyone who has tried to rebuild a quadrajet will tell you they hardly ever work right after the rebuild