i just got a 89' 4.0 non h.o. it starts up fine but as soon as you touch the gas it falls on its face and start chugging and barely runs.do you think you guys think cam postion sensor? maybe timing is off?i cant tell if it is starving for fuel or choking out.its my girlfriends rig so i need to get it going and im a cummins guy and have no idea what the heck to do.thanks alot guys.