my "engine check" light just came on today. along with a blinking "traction off" light

first the car having trouble idling, shaking and crap will in park. then the car was studdering when i gased it, then 5 minutes later those lights came on. now it doesn't shake or studder, but i have those warnings.

anyone help me? taking it into Lexus on Monday

 

bad sensors? definitely time for dealership man

 

ok, just got back from the dealership, which gladly took my $90 just to look at it! anyways, said i had a misfire in the 1st cylinder. everything is fine now. computers ran a check and things are back to normal.
possibilities he said:
-elevation change from CA to UT
-timing belt if off (just had it replaced 4 months ago, so there could of been an error in installation)