About 2 weeks ago my x started to get this really annoying hesitation/miss under acceleration. I looked under the hood and found that the air intake hose had partially slipped off of the mass air flow sensor, so I put it back on. A day later the problem was back so I looked under the hood again and found that I had forgoten to re-attach the PCV vaccum hose to the air intake, I did this as well as tightened up a loose spark plug wire. The X then ran great until yesterday when the problem came back again, this time I can't find anything under the hood that is not put together right, everything looks good. I put new plugs, wires, a PCV valve, and fuel filter in about a year or 25,000 miles ago so I doubt that any of these parts are the culprit. I am going to test the ignition coil as soon as my dad gets home with his test meter. The check engine light hasn't come on so a code reader won't do me any good. Anyone have any ideas???