Remove the power trunk release, it may be stuck and holding the latch to the open position. I had same problem and found that if I use the key to unlock power lock then closed trunk - it worked.
yes, it does in my 1991 buick park ave.
replace the truck motor, or spray the existing one with wd40 to be sure all moving parts are well oiled.
The Buick Park Avenue Started In 1991
The Buick Park Avenue nameplate was first used in 1977 on a model of Buick Electra, but did not exist as a standalone model until 1991, when it replaced the Electra.
what are you takling about? no such thing!
fuel pessure test
You dont. The computer does it.