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tighten up the intake manifold bolts. Remove the valve cover and resecure the head bolts. Water may be getting in . The blocks steel. the heads and intake aluminum. The two metals deal with heat in dynamically differant ways

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Q: 97 ford f150 4.2 engine misfires on cyl 4 replaced injector and coil pack plugs and wires and also new fuel pump.why does it still run rough?
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