2002 Mitsubishi Eclipse Power Loss ONLY when in lower RPM's

I have an 02 eclipse with about 140,000 miles on it. When I accelerate up hills while in lower rpm's the engine seems to hesitate and not want to speed up unless I go farther down on the petal which at that time the car downshifts and the car accelerates well. The car idles fine and has never died on me. Sometimes it feels like the engine slightly misses. This issue just occured recently and did not accelerate this slowly up hills till now. I was thinking it could be a spark plug wire or distributor problem; At the same time praying its not the fuel pump. Any advice would be greatly appreciated.