I own a 2005 Chrysler Sebring Touring with 120xxx miles. It's having random power surges. The RPMs will drop to the point of it almost stalling then rev up on its own. When I'm driving the RPMs will randomly spike past 4 on its own & it won't shift into a high gear (not sure if that's due to the power surges or if it's just a transmission problem.) It will stall at random whether it's in drive or park, will stall while I'm driving going any random speed, & sometimes won't start all together. I JUST paid this car off last week & I don't want to get another car until I absolutely have to. I've had the MAP sensor replaced & the throttle position sensor replaced. Please help!