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I would check the fuel pressure with a gauge first. Assuming the check engine light is not on. You didn't say if it is the 4cyl or V6, but both have plug wires and coil packs that could be failing. Even the crank sensor could cause the problem at high speeds and under a load.
Start with the simple things first. When was the last time you had a complete tune up? "Missing" could indicate bad spark plugs, bad spark plug wires, or bad cylinders. Change the plugs first, then go from there.
well i think the piston ring are already loose, causing insufficient air compression leading to lower power especially on uphill tracks. check also for the air-fuel ratio! too much fuel usually is the cause for thick smoke emission; too much air, causes also less power.