[burijon]

How many miles? What kind of preventative maintenance prior to purchase?

I would guess ignition coil or crankshaft position sensor. Both parts are fairly cheap at rockauto. Possibly could be the mass air flow sensor or the connector or throttle position sensor. TPS is fairly cheap as well. MAF is not cheap however. Try cleaning the connectors and putting electrical grease on it.

Another way around all the guessing is to hook it up to a computer and have it diagnosed. Generally with OBDII there is still a 20% + or - either way for sensors. So one could be at the far end of a sensor variance after the motor is hot. Seems more like a heat issue based your summary.

Let us know!