I've got a 88 Civic 1.5L with dual point injection(throttle body). The car idles fine, and if I accelerate very slowly, it accelerates. But, if I press the throttle quickly, the car bogs down and backfires. I've replaced the plugs, wires, rotor, distributer cap, distributer, and the fuel filter. I've had the fuel pump tested for volume and the fuel regulator checked. I've swapped the entire throttle body and eacv. Nothing has made the problem go away. I've also changed the MAP sensor. Anyone have any ideas of what else to check? Help please.

Forgot to add that I also have checked the main relay as shown in the shop manual. It's fine according to the tests.