I'm having an issue with my car. Sometimes when idling, it drops the Rpms a little and I can feel and hear it when it happens. I have no idea what it could be and my car seems to be running fine. I also sometimes smell like a burnt smell coming from the exhaust when I step on the throttle hard and it sometimes makes a rumbling noise too. What can cause these problems?
My car has 65000 miles.
My car has an automatic transmission.