I'm having a problem with my 292 Chevy. After warming up, it misfires while holding a speed on level ground, when I accelerate, the miss goes away and it pulls very strong, level out at speed and the miss comes back and gets worse. Some info , the engine has about 3000 miles since a rebuild, it has a very small comp cam, offy 4 barrel intake, Clifford headers and points distributor. Everything ran fine until a couple months ago. any help would be greatly appreciated.
