Won't start/dies on 1995 Buick Riviera

I bought a 95 buick riviera supercharged, only the 3rd owner, no prior problems reported...every now and then right after i put gas in it either won't start or dies soon after...when i put my foot on the gas it doesn't register and the last time in the midst of breaking down i lost power steering and breaks. i don't know if those problems are because it died or not but i do also have a gash in my muffler/ up by where it connects by motor. whats wrong n how do i fix it?

1 answer
do you have any eng codes? if so post so we can adv