Major RPM fluctuation
I have a 2011 Chevy Malibu and every time
we start the car the RPM flucates between
900 and 1500 it lasts for 1.5 mins and its
beginning to affect drivability. I have heard
that it could be IAC but 3 different
mechanics have told me it's doesn't have
IAC and now I was told it could be TPS
(throttle position sensor) there is no check
engine light on so its hard to diagnose. Any
thoughts?