i have a 99 intrepid with the check eng light on i read the codes p1391 the code says glow plug low volts what a glow plug?
Umm.. you're looking at the wrong code. Glow plugs are for diesel motors, they warm up the air in the cylinders so the diesel can fire, your intrepid doesn't have glow plugs. That's why you turn the key on for 5-10 seconds before starting a diesel.
you dont say if it stumble stalls code 1391 is loss of cam or crankshaft sensor