Hey there, hope you had a nice time! ALWAYS USE CHAMPION COPPER/PLATINUM Plugs! I tried BOSCH Platinum 4+ Plugs in my 99ES 3.2L and it seemed to make my engine run a little rough at idle and at slower speeds. Fuel mileage did improve a little though. It seemed if low end accelleration lagged however. I never reset the PCMALR so I'm not sure if that would have helped since it helped with the K&N issues I had. The service advisor at my dealership found out and tired to pull some BS and void my warranty when I asked about the plugs. I fought it and told him that it was BS since I only had them in for a couple of weeks.
The plugs that the dealership calls Mopar/Champion 100,000 plugs are the same Champion standard Copper/Platinum plugs you can get at like Kragen/Chucks/Autozone/Pep Boys Etc. They should be pregapped at .50 but check to make sure. The only difference is the box and the price. Dealerships want almost $60.00 for a set, go to an auto parts retailer and you should be able to get them for around $13.00 for the set as I did. They are the exact same plugs. You'll also notice that there is absolutely no statement or guarantee for anything near 100,000 miles. They are usually guaranteed for about 3 years which is typically about half of 100,000 miles or less, sometimes much less.
I have done extensive research as to the best type of plugs to use and that is what I have come up with.
ottowrkr: Yeah, I don't know, the dealer does what's prescribed by Chrysler and in what's in their service database. These guys are also trained by Chrysler. When you request a Fuel Mixture reset to factory defaults or it's included in one of those over priced service packages they rest the vehicle's Adaptive Learn Routine for the PCM. They make it sound complicated but all they do is remove the negative battery connector for 15 minutes.
Hopefully some of that info helps.
Take Care!
MoparPerformance
[ January 02, 2002: Message edited by: MoparPerformance ]