i have a 87 ranger 2.9 4x4 5 speed... picked it up real cheap for a project. it runs but not the way it should. i have put on a new altenator, new tps, new o2 sensor, plugs wires cap and rotor, new fuel pump relay and pulled all the codes and nothing is pointing me in the direction of why it runs good cold, idles smooth and runs good at wide open throttle but at mid range rpm or around 2000 to 3000 rpm when the motor is under load it cuts out and surges until you give it wide open throttle or come to a stop. it never dies... so i am lost. i am a newly certified mechanic and know alot about cars but these old computer systems i cant figure out... i cant stand not having no live data... so can anyone help me out

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mossyoakranger99