Hi,I have a 1999 Protege 5spd 80.000 ml, runs fine on H-way but problem starts in heavy trafic "stop and go", after 10 - 15 min will run like w/out 1 or 2 cylinders so I have to stop or will cut off on me. After few min of rest will start and is ready to go till next trafic jam... any idea what may be wrong wrong?