bkte

I forgot to mention it is mpfi engine

I have a 1990 legacy wagon. I have severe loss of power intermittently, @ around 2000 rpm. I can get over the hesitation by flooring the pedal, but if I let the rpm drop below 2000, it has same problem. There is no engine light, and the ecm shows no faults in test mode. I have adjusted the tps to spec., and have replaced the MAF and fuel filter to no avail. The air filter is also new and hoses all look good. Spark plugs are good, as well I even tested the ignition coil and plug wires. Have also tested fuel pressure, and the regulator. Getting frustrated have run out of ideas. I hooked my vom to the sensor wire to ecm to look at volts as I was driving and the tps responded as it should. I thought the tps would be the culprit, maybe dropping it back to idle. Any suggestions would be much appreciated