odd 460 engine stumble
The plugs, wires, dist. cap, fuel filter, and throttle position sensor are all new. The vacuum lines have all been checked. Spark is strong, though I haven't checked the injectors yet.
When I race the engine it roars nice and strong like it should. The problem only shows at idle or when the RPMs are otherwise at a constant speed. It has stalled out once while idling, and also stalled out then came back while driving. I've been told it could be stuck valves or carbon build-up but without tearing the engine apart how can I diagnose the real problem?


