No i haven't unplugged the MAF when this happens but the MAF has been replaced last year and no difference in the problem.

My 90 Buick 3.3 would completely stall under heavy acceleration when warmed up. Turns out the OEM engine temp sensor was bad and I guess giving such out of spec readings to the computer that it would stall.
Just wanted to mention that in case it might be the cause of your stall problem and might not throw a code and I bet your dash uses another sensor to show the temp.
Also perhaps there'* a problem with the throttle position sensor although that should throw a code.

This thread is a few years old now & is regarding a Park Avenue with a 3.8 engine.
If a thread is more than 6 months old, we would prefer that you not reply to that thread.
Instead please make an new thread, with a link pointing to the old one.
Most of the time, the OP'* haven't been on in years and more than likely they won't respond.
Thread Closed.