Besides the Seafoam through the gas tank I would remove the throttlebody and clean both sides with Seafoam spray and a soft toothbrush. Your 2000 has a IdleAirControl (IAC) valve screwed on the side of the throttlebody. I would remove this and also clean with the Seafoam spray. Seafoam also has a relatively new spray can with a hose to clean the intake manifold. Won't hurt to do this also. You can see all the "how to" videos on there website.