O.K., so the ECU is ruled out. It is not the compression causing this either. You can also check the air sensor pot while the car is running, this may allow you to examine if there is erratic change in sensor voltage when you get the hesitation. The same pins (middle pin and one of the two neighbouring pins, I dont remember which one but you can figure this out) you checked resistance across, now measure the voltage. Note, to do this test, the sensor connector must be conected to the pot, so you can use alligator clips to firt make all the connections. At idle, you should get between 0.5 and 1V, ideally 0.7V. Then as you smoothly press the gas pedal, the voltage should increase gradually. Notice what happens around the hesitation point. Do you see a voltage that dips down.

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Saumil S. Patel