Q: 4.0 lt is very sluggish. no exhaust restriction, fp is ok 45psi, all new tune up.

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This is a 4.0 lt 94 ford ranger. The engine is very slow to come up to speed and doesn't have much pickup speed on the highway. The exhaust has been checked, has new plugs, wires, coil pack. air filter checked, maf sensor cleaned. I have a 3.0 v6 that will run circles around this 4.0. Probably something simple but what?

My car has 107000 miles.
My car has a manual transmission.

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