A bad O2 sensor can cause strange symptoms. When I replaced mine with a Borg-Warner sensor, there would be times driving on the highway where it would appear as if the engine had shut off, although it had not. Stepping on the accelerator slightly produced no response. Either backing way off, and the accelerating, or stomping on it would finally make it go. I even took the car in to have it scanned for problems to try to find the cause, as well as discussing the problem with a few mechanics, with no problems found. It wasn't until it went all together and threw a code, that I found the problem, and that Borg-Warner O2s don't last any longer than the Bosch. Replace the O2 sensor with either an AC/Delco, or Denso, and see if that problem goes away.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.