My buddy has a 97 Ranger with a 3. 6 cyl and he cannot get it running right and the weird thing is that it is not throwing any codes. The first thing I wanted to ask is how to diagnose is the ECU. I am not so sure that it is not running on limp home. It starts idles well for a few minutes and the idle turns rough. On the road it acts like it is running lean meaning the more you put your foot in it the more it gasps, absolutley no power. He has checked for a intake leak, changed the TPS, 02 sensor, crank and cam sensors pulled and tested the injectors without positive results. The vacumn is fairly low at a steady 15lbs and the fuel pressure is at 37 lbs and there is no CAT.
Any educated guesses?