My mother has a 2005 3.3 T&C.
I have had problems three times with new RE14PLP5 Champion double platinums quickly going bad by losing the welded-on tiny platinum discs.
I finally did away with using the OEM plugs with
NGK LZTR5AIX-13/2314 Iridium plugs
and the problems went away.
On the 2005 there was also a TSB indicating that some OEM coil packs were bad.
I tried troubleshooting the spark problems with a KAL Equip ignition analyzer
http://www.ebay.com/itm/Kal-Equip-Spark-...739&vxp=mtrthat clips on a wire and gives you
peak KV,
average KV and
spark burn time,
but found that with the 3.3/3.8 "wasted spark" two cylinder firing coil packs, you had to disconnect the wire to the other cylinder and connect it instead to a known good sparkplug simulator
http://www.ebay.com/itm/Adjustable-High-Energy-Ignition-Spark-Plug-Tester-Pick-Up-Coil-Diagnostic-Tool-/231314358857?epid=1326254621&hash=item35db690249:g:14MAAOSwxH1T-AoA
