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randomly running rough, check engine on when happens.
hoping to get some help here.
i have a 96 f450 7.3 auto service body with 115k miles. last day or so it has started to randomly run like a model T (best i can explain it). when this happens the check engine light comes on, then just as quick as it came on it might go off and run fine.
i have played with the 4 plug connections on the valve covers. my problem is much like it sounds with one of the plugs undone. my mechanic is convinced that the plugs are the problem, but to me it doesnt seem to change things by wiggling them when it does run rough.
also, the check engine light does not come on when one of the plug connections are removed, but does run rough.
so whats really bothering me is why the plug connections would be the problem if the check engine light doesnt come on when they are removed. when my problem starts, the check engine light immediately comes on.
sorry for the book, just wanted to be clear as i could. any help would be greatly appreciated.