I have a 1997 i did a 411 swap on and i can flash the PCM no problem. But once its been flashed once..

You have to pull the battery
Wait 30 seconds
Hook battery cable back up
flash peramiters

Its annoying but not impossable. Id rather not have to do it. I always disconnect my loging tool software befor attempting to reflash the PCM.

Any Ideas what may be causeing this?

Thanks,
HKH