about a month ago i had a problem with my 07 z in which the car would stall out and it wouldnot wanna move through the rpm range when stepping on the gas. i took it in for service and they said it was the throttle chamber and sensor and all that when this happened i took out my k n n filters thinking this could somehow be the reason for my problem up until yesterday when i put them back on today i was having similar problems to the first time i took it in for service so i switched back to my paper filters and filled up with premiun thinking that maybe the gas attendant at wawa may have put regular. since switching back to the paper filters and filling up with premium the car seems to run fine yet my service engine light poped on not sure if i should take the car back in for service or since car seems to be running fine drive for a few days and see if the light will reset itself