1992 suddenly loses power and throttle response
 

92 Accord ex w/MT with 190xxx miles. It starts and idles great, and when you first take off, it runs great with full power. When you come to a stop and take off again, it doesn't have any power and doesn't want to rev up, it still idles fine though. If I turn the key off for a few seconds then restart, the car is fine and back to full power until I slow down of stop again. Its almost like it has dead pedal. It doesn't matter if the car is hot or cold, and there is no CEL. It did this about 4 months ago to my wife on her way to work. I got it home and checked everything over, but I couldn't find anything obvious wrong with it, then it just went back to normal all on its own while I was driving it up and down my street trying to diagnose the problem. Now the problem is back out of the blue and I'm clueless.
I did check for codes and I got what seems to be a code 48, which by my research has something to do with the oxygen sensor, but even with a bad O2 sensor, I don't think it would cause this.
I do know it is something electrical and not something clogged, otherwise it wouldn't "reset" (for the lack of a better word) when I shut it off and restart it.