I need all the help I can get here. Quick run down,1990 trooper 2.8L auto 185k miles. I was told the motor was replaced when I got the truck with a 50k motor? My problem now is that I have major loss of power problem that started a few months ago. Now I can't get the rpms over 2800. I cleaned the injectors best I could seem to be spraying fine, timed the motor, pulled a #34 code and replaced the map sensor. New plugs.new pcv checked for vacume leaks, newer wires,cap and rotor (3months). Now what.....? Any help Please?