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Start with checking the air filter.The black smoke means to mutch fuel and not enought air.You may want to clean your Mass Air Flow sensor as well. The have spray cans of MAF cleaner at any auto parts store and you should clean it with every air filter change.Just be sure to unplug harness before you spray it.Well good luck and hope this helps.
You could very well have a pump that is weak and loses some of it's pumping power after it has gotten fully warmed up. Have you ever noticed a temporary improvement in power after refiling with cool fuel? A test drive with a fuel pressure gauge should tell the tale about pump condition. Usually a restricted filter will cause a starvation problem all the time instead of just after a long drive. It certainly wouldn't hurt to change the filter but I doubt that it is your problem.
you will have to drop the fuel tank ,remove the straps while supporting tank,remove fuel lines and vent lines,lower to ground ,remove ring that holts pump ***. in tank.Be certain to change filter and strainer
Fuel filter is the main culprit when you lose power going uphill. Going level or downhill means that the engine doesn't have to work all that hard and doesn't demand much fuel, so a partially clogged filter can usually flow enough to allow the car to run smoothly. Going uphill requires signficantly more fuel, and if the filter is clogged up, it won't be able to flow enough fuel. This will bog the car down and cause you to lose speed. Change your fuel filter.