the 3.3 engine is strong, and just overall a good engine. but it seems to be a common thing with high mileage that they seem to act up especially when cold. ive had the plugs, wires and mass air flow sensor replaced. there is no, NO check engine light on. and when its real cold, when backing down the driveway it sometimes dies. when running at running temperature, it runs better, but still hesitates when starting to accelerate....possible o2 sensor, mass air flow sensor, spark plugs....