The Headgaskets where just changed so the motor was torn all apart and now that it is back together the motor sputters when turning it on and acts like it wants to die but once you get it started and the motor warms up you can shut it off and turn it back on with no problems and the car runs perfectly.. I used the obd II on it and i get a error like manifold absolute pressure/ Denso sensor... Can anyone help me with this??? I am not sure if this could be caused by a sensor and if so what sensor may this be?