Just recently done a head gasket and water pump and about two weeks later my car is acting up. It was fine but one day my cel flashed but never stayed on or anything an I haven’t seen it come on since. But since then after I’m driving a good 10-20 min very randomly the car will jerk a couple of times and the rpm will bottom out and go back up to normal in sync with the jerking … all while the car is still running and driving. It goes back to normal when I let out then push the gas again .. It feels like it’s cutting off but doesn’t actually cut off…