I was driving today and all of the sudden I felt the acceleration of my car stop. I let off the gas pedal then pressed it again and it was as if I wasn't pushing it at all, to the point of not having a gas pedal at all my jeep stop complete and shut down then i started again and engine start normal its not the first time this happen the last thing i change was the crank sensor and i check and the mechanic from the dealer check for a code but no code found. any ideas??