I've got 55k on my 04 srt 10. It seems to help to run a can of sea foam thru it every 5k or so. The automatic car wash killed my tps, or at least the problem with my idle came up after a trip there. I don't think its causing your problem, but i've been running a 170 thermostat for 4 years, thats not causing your problem either. I go out and run the snot out of my truck every once in a while and it always runs better afterwards. This isn't grandma's buick your driving you know.