Shift kit help
So I just had a shift kit installed and it was just gaskets and new springs I believe along with an aluminum driveshaft. My car is being completely weird now. I gas it and rpm will just either sit there then go up after a few seconds, go up rpms then stop before going up then stopping again repeatedly, or go up to 5000 rpms then drop to 4000 and sit there like there's just no power going to the wheels and just stay there until I let off the gas. Any idea what went wrong? Should I stop driving it immediately?