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How many miles on it?
Did you scan the PCM for any CEL trouble codes?
How does it idle?
Whats a cks and tips?

One easy thing to check if its misfiring on multiple cylinders is the injector harness where it snakes over the engine to each injector and also where it sort of bends near the firewall. Check for broken, burnt or frayed wire insulation.
This was a problem on my old '94 4.0
If its misfiring on just one cylinder, could be an injector.

Some other things, bad ground, MAP sensor, TPS sensor, clogged CAT or muffler, vacuum leak, cam sensor and O2 sensors though that should show up as a CEL trouble code if you scanned the PCM for CEL codes.
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