Hello! I have a 2005 Jeep Grand Cherokee Laredo 4x4 with the 3.7L engine. Recently it has felt like my transmission has been messing up. It feels like the gear changes are not correct, and if you accelerate a little bit quickly and immediately let go of the pedal, the engine light just comes on and the engine revs with no power to the wheels. When this happens all you have to do is stop and the power will come back to the wheels. Any suggestions, and if so will it be expensive? Thanks!