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What would cause a false code 33 MAP sensor reading? I have replaced it.

(1990 Chevrolet Camaro)
in Fairfield, CA on September 14, 2013
I have replaced the cat. conv. and car ran great for a day, then I completely cleaned the throttle body and again it ran great for a day. I replaced the MAP sensor due to a 33 code and nothing. The car tries to start but dies, applying gas makes starting even harder. When it does start it runs very rough and dies almost immediately.

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on September 14, 2013
Need to know how much fuel pressure it has. Test it, get it tested or whatever but that is what we need to know first!
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on September 15, 2013
Call Milt's Service Garage in Vallejo (707)643-7548 to have the diagnosis completed. Just because you have a code does not mean the sensor is bad. Check wiring, check connections, pin the computer. Have the car put on a dyno to check air fuel ratio...
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