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I have been scratching my head about this one for a while now. When the truck is idling it feels like the engine skips a beat which sends a considerable bump you can feel through the whole truck. I guess you can call it rough idle, only it doesn't happen all the time. It can idle fine for five minutes in a row and then start doing it when it would start stumbling every two or three seconds. It usually gets worse when the truck worms up. Loading the engine seem to affect it for the worse as well (putting it in gear, especially turning AC on). However, it will still do it in park with nothing else on, just not as often. When I stand in front of the engine and this "stumble" happens I could hear a click (sounds almost like a relay click) coming from somewhere in the area of EGR valve. Not sure if it is cause or effect of stumbling though. When it starts happening while I'm at the light and I start accelerating, you can feel it through the initial stage of acceleration as intermittent hesitation. Other than that it feels normal while driving at higher speeds. I did feel it happen one time going on the highway though.

Check engine light is off. So far the things I've done are: clean the throttle body, new air filter, cleaned MAF sensor, cleaned grounding wire from the battery, ran a bottle of seafoam trough it, changed the distributor. Nothing seems to affect it. Any ideas what else may be causing it?
 

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I've never found any info on this. Even though it appears to be a common problem.

I'm thinking its a bad injector but haven't got that far yet.
 
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