Car won't start

i have a 2000 Camaro V6. i was driving and then all
of a sudden the car wouldn't accelerate and started
running rough and shaky and then it shut off after i
kept trying to accelerate. now it won't even start. i
put the computer on it and read the codes and i
have a code that says it's a MAP sensor and
oxygen sensor and multiple misfires but i recently
changed my spark plugs. I replaced my ignition
coils, wires and ignition control module about 2
years ago, so i just replaced the map sensor and
i'm still getting the same results with the car not
turning over.