Originally Posted by delsolproblems

Have you ever messed with the TPS? If not, check the following. Hopefully you will find the problem early. Start by replacing any regular maintenance items that you haven't serviced in awhile- filters, ignition parts, etc. and clean your grounds. Next, check the ignition. Disable the injectors and get a new or known good spark plug. Wear gloves (welding gloves work great), preferably with latex or nitrile gloves underneath, and remove a spark plug wire from its plug. Connect the good plug to the end of the wire and hold the plastic deep-well tube at the very tip of the wire end with the threads of the plug touching bare metal on the valve cover. Have an assistant crank the motor while you watch the spark, carefully keeping all body parts away from the plug. Different types of plugs have different colored sparks but usually a good spark is bright pink or at least bright. Check all four wires. This will test your entire ignition. Finally, either check your fuel pressure or replace the pump, saving the receipt. Sorry I can't be more specific but a weak idle like yours can really be caused by alot of different things. This will at least give you a full engine tune up and afterward you will know everything is working great.