I have been trying to figure out whats going on. At idle it sounds terrible and would stall sometimes when i stopped or put it in gear. I was checking voltage on my sensors when I unplugged the TPS and the car started running great. I'm going to replace it. I hope it fixes it but are there any other suggestions in case this doesn't fix it?

 

Idling issues can be caused by a lot of different factors. I can give some "general" things to look for.

1. Check all vacuum line for holes/deterioration. Replace the bad ones, and plug off any unused vacuum ports.
2. If your sensors are reading proper, check your fuel injectors. The Haynes manual specs, for the total ohms of resistance, for the V6 is 11.0-14.0. Note*** That is for all 6 injectors combined. Individually checking each injector is probably the best way to do it, though you may have to remove the intake plenum.
2a. Also check your fuel pressure. There is a check valve on the back, of the fuel injector rail. The stock pressure should be reading between 39-47 psi.
3. Install a fresh fuel filter, and change it at the proper service interval.
4. Check your exhaust. A clogged catalytic converter can be culprit. If anything, and you don't have to pass inspections, just remove your cat and be done with it.
5. Install fresh spark plugs, and you don't want to get fancy. Go with stock plugs. Cast iron heads and platinum plugs don't usually mix real well.
6. Check your distributor. These are a problem item, on our V6 3rd Gens. The shaft seal goes bad, causing oil to leak all over your starter. The reluctor coils are prone to cracking. Save yourself a lot of heartache, and get a reman from Autozone. They use a different reluctor coil set up, and are much better design.
7. Clean your throttlebody regularly. Do NOT use carburetor cleaner. They make a cleaner, designed for fuel injected cars. With our EGR being piped in just behind the throttlebody, it gets fairly dirty, very quickly.
8. Finally, make sure to double-check all your gasket areas(plenum, egr, etc.) for vacuum leaks. You can try using starting fluid or my Haynes manual suggests soapy water. Why? I don't know. Take a piece of 3/8" fuel lines, and put one end up to your ear. Then run the other end near the gasket surfaces. You will hear a "hissing" sound, if any areas are leaking.


I have a thread titled, "Problems Areas in the Engine Bay", here. You can find it, and use that as a told for locating current and future problems, that may or may not occur. I have had my 3rd gen for almost 3 years, and little by little I'm making sure to knock out those problems.