I'm having trouble diagnosing a issue with the old brick.

I started about two weeks ago, she starting to stall at a red light
so I gave her a little gas and the muffler exploded. I managed to
drive home. the next day she would not start.
This is what she is doing...
when I turn the key she will fire, but she'll rev to 5000 rpm and stall ( thats not giving any gas)
if I do give some gas she'll studder a bit than stall.
Now every time I try to start her there is a poping snapping sound from the left side of
the block followed by a sizable puff of smoke.

I have replaced the plugs and wires, checked fusees , fuel relay and both pumps
seam to be working fine.

Anyone ever had this problem? Any info

help !!!!!

stranded in Quebec