for one im a new member..so hello.....but i am having some issues with my 2002 300m...i had my vehicle in the shop for few days for tires and random missfire...it was throwing code for cyl 2 then you fix that and cyl3 throws code..then back to 2 then 4..they looked at everything and then thumbed the intake and cleaned throttle body...and they called said it was ready...my wife picked it up due to i was working...but she said ran great except down shifting weird...so i got home and took it for a ride...right out of the gate i noticed a problem..it was idle high...not real high..but about 13-1400rpm...when driving it seams fine....but i looking closely at gages the rpm is moving up and down just slightly...same with speedo...bout 1/8 inch...maybe just me but little weird...when breaking at stop sign it seems fine untill its down shifts to first...it seems to be a bit late downshifting...and right before it does it revs up a bit about 300-500rpm and kinda jerks a bit into first...not a hard jerk or a clunk...but more of a jerk due to rpms.....what the heck is going on...