Help with trouble shooting 94 Olds Cutlass Supreme

the car was running fine, all of a sudden...wouldn't accelerate. It will start - and it seems like the fuel injection is allowing electric and all that - plugs good ... i hear a noise toward the back like
something is clogging the muffler and then....it won't give gas at all - can't keep it running. i was able to get it into gear and all the battery / electric works. I was able to get it back in gear and move it off the street but there it sits and now it won't even get gas.
Does this happen when injectors fail? Is the reason why i was able to get it back in gear a few times, but it wouldn't accelerate?
Could be a Fuel Filter, Mass Air Flow sensor or possibly Fuel pump from what i've been able to gather, but i don't want to get ganked on replacing something that doesn't need replacing. Any suggestions? Please.
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Yes could be low fuel pressure, a clogged cat, a bad maf, try disconnecting the maf see if it is better, check fuel pressure if ok, check for a blocked cat.

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