I have a 2003 GMC Sierra with 60,000 miles on it. I have automatic transmission and just a few weeks ago, my car started having problems shifting gears. The best way to describe how the car feels would be like driving a stick shift. There is a delay between gear shifts and it is very jumpy.
In addition, since I have started having this issue, my engine has cut out three times while I'm at a stoplight, although the rest of my car remains on (lights, radio etc). I just put it in park, restart the car, and then it works just fine.
Sometimes when I'm stopped at a stop sign or stoplight with my brakes on, I can hear my engine rev slightly higher than usual and I can feel my truck move slightly forward, like I had just gently pressed the gas pedal, although I'm obviously not. I am not car savvy and could use some help with this problem. Any insight?