To start with the carb is a rochester 4-jet which isn't really a quadrajet, but this looked like the most appropriate place to post. The car is a 64 300 Skylark with a mild cam 10:1 compression, ignitor ignition and stock aluminum heads and intake. The car was running well and then all of a sudden over night I have a bunch of problems which appear to be carb/fuel related. 1. I have a "dead spot" just off idle at all speeds when cold or warm. The only time I don't notice it is when I am going 60+. Even if I am crusing at like 20-30 and then punch it from idle to wide open the car will hesitate (soetimes even stall) before it gets going. 2. The car is a b!tch to start when cold but starts fine when warm. The choke appears to work fine. The battery is strong as heck and the ignition seems to work well. 3. I have a knocking pinging under WOT at high RPM. This screams "lean" to me. To be fair I wasn;t going WOT all the time before the problem, so it is possible this is a preexisting condition. As I said this hasn't gradually built up, it literally happened overnight. The only potential related factor is my wife overheated the car when she blew the radiator hose a few days before it all started, but that was only for a very short time. I am thinking it is anvacuum leak somewhere, a malfunctioning accelerator pump or a bad power valve (no idea what a pwer valve even does but I do know they blow). Anything else you all could think of or do you have any advice?
did you clean the distributor cap out after the hose blew? could be crossfiring? can you swap a known good carb to your engine just for troubleshooting? good luck
Unfortuneately I don't have another carb to try out. I didn't swap the distributer cap but the cap looks ok and I figure it would have dried out after running it for a while. I will pull the cap off and check though. Thanks for the advice.
