Situation:
1 2.5l engine
2. Manual trans
3. Altima stalls when put in nuetral or clutch depressed. No indication before stall of drivabilty incident. Going at about 30 70 km/h than depress clutch rpms drops to 0 rpms and all lights come on in dash. Alpha ratio at idle fluctuates between 82 - 95%. Plugs showing lean condition, alpha sjowing rich condition, rear O2 slow responding. When depressing clutch to slow down or slight throttle alpha increase to 107 - 110% Replace ETC and performed throttle positions and idle relearn. Replaced ECM . All seem to be effective for awhile but condition reoccurs. Cannot duplicate problem all the time only during warmup under load that it happens.

If anyone has any suggestions or if another nissan tech has come across a similiar proble let me know