Question about 2003 Ford E150

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Sounds and feels like it is miss firing, ongong problem..

This started about 2-3 yrs ago, checked wires and found burnt marks, replaced wires & plugs, then and the following year. It seemed to be a temp fix. Last yr it occurred again, lean mix; vac leak in the upper intake, which was replaced, along with plug and wires again. Now it is worse than ever.........I'm stuck...business is bad, not too much money, broken arm!!! not my year. I would have given up by now, but I cannot afford another $500-800 bill to replace a part, then only to have problem come up again...frustrated. Any help would be great.....Guy in South FL.

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