What problem does my car seem to have?

Has the car had any maintenance lately? I would change the spark plugs, spark plug wires, air cleaner filter, check and possible change distributor cap and rotor. Any good mechanic would start with this anyway and you can probably do it yourself, although there are 2 plugs on a V6 at the firewall that are a little hard to get. After that it could be O2 sensor,MAP or TPS. Hope this helps.