1. Have you been doing the regular maintenance for your vehicle? You should have a book that explains when to do certain tune ups or replace certain parts for these vehicles.

2. Sounds like an issue involving your fuel system. I would take it to a mechanic if you are not very handy and have them inspect your fuel injector system, Fuel filter, Fuel pump w/filter attached.

3. When was the last time you did a engine tune up? Spark plugs, Wires, Air filter, Belts, caty converter, 02 sensors, and all that good stuff? May not be related, but it's something that is necessary for your vehicle.