the problem with your car accelerating sounds like a coil issue had the same problem with mine only when i stamped on the gas the car would miss one hell of a lot check all my coils to find 3 had been replaced with new items and the others were still original pulled them out and found cracks in them replaced them and haven't had any problems at all used to be kinda scary when over taking and you plant the foot and the car just doesn't seem to pick up fast enough and you've got traffic heading your way