odd 460 engine stumble
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odd 460 engine stumble
Hey, I have a 1994 e350 base RV with the 460. I've been having an odd stumble for the last month or two where the rpms dip for 1/2 a second seemingly at random. There is also what I would describe as a muffled backfire somewhere that seems to coincide with the 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?
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?
