My wife's 01 Hoe has been gard starting for a while, like maybe the starter is going or something. A couple of weeks back we had it tuned up (plug, wires fuel system cleaner, etc). Now just today it started losing power druing acceleration and part throttle cruising. It will be going along fine and when you hit the go pedal the slightest, it will buck and miss. Does this sound like the fuel pump is going or what could it be?