Misfiring problems on 1997 ford club wagon (van) 5.4 Lt v8?

I just bought a 1997 ford club wagon. 5.4 v8. When you match your speed and try to cruise my motor causes the whole van to vibrate hard. I think it's misfiring. It doesn't run rough when you accelerate or slow down. Everything else about the van is perfectly fine. This van has 283k miles on it. The gas sat in it for 8 months, i put some seafoam in it and high octane stuff. Could you give me a list of things you would do to fix my issue and any other maintenance you'd do to a old van? I'm thinking my misfiring problems is from bad coilpacks or injectors.

Check out the driveshaft or out of round tire or wheel. A worn out universal joint, bent rim or bad tire will cause vibration at cruising speed.

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