Follow the advice above, and you will find the issue.
I did want to add just for reference, that on my '97, I had the situation where I had 3-5 lbs of boost, max (ran my one and only 16.0X at the dragstrip with it
) and replacing the BCS fixed me back up. So, for whatever reason, I was getting some amount of boost with a solenoid that was either failed or failing. I suppose it could have been a vaccum leak, as I replaced the vac lines at the BCA/BCS at the same time as the solenoid, though, but I am pretty sure I repalced the lines first with no improvement. (of course, I could be totally wrong or senile)