I've been rehabbing my 1977 Ford pickup (351 engine) that's been in storage for a few years. I just finished rebuilding the carb, and it seemed to go pretty well. It starts and idles fine. When I pulled out on the road, it ran fine for a few minutes, then it started to die every time I'd press down on the accelerator. As long as I let it idle or press down just a hair, it keeps running, but if I try to give it any more gas, it backfires through the carb and tries to die. Even coasting downhill, it doesn't want to go faster than idle speed will allow.
At this point, I was thinking the mixture was way off or something. But after several minutes of this, it straightened out and ran fine again. So now I'm wondering if something could be sticking open or closed that would cause this. Any ideas?
Thanks,