Engine Hesitating In Third And Forth

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If you put the plugs in without gapping them, they may be gapped for a different application. I don't know the 4.0 well, but if it has spark plug wires, make sure they aren't damaged or laying on a hot manifold. If it has Coil Packs, make sure they are seated properly and the boots are OK. Like Sparta says, double check your work.