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1990 ford ranger, 2.9l, V6, starts and runs rough, however after 20 minutes rpms go way down, backfires, and will only go 10 to 15 miles per hour. Happens every time. Then if you leave truck off for a few hours will do same; start rough and run until next 20 minutes of running, when power really reduces again. Changed plugs, plug wires, distributor cap and rotor, fuel filter; same problem continues?