The manual that I got says it sould be 34-36psi idle to full rpm. That just doesn't seem correct. And if it is what could be my problem. Could a plugged up gas tank vent cause that, because I had problem with bee's and noticed some hanging around that area.

Then the fuelåpressure seems OK. When you said that the MAP circuits checked out fine, what exactly did you check?

I followed the flow chart that I have for that code. I checked the 5v ref. and ground all the way back to the ecm. So the wiring checked out on all 3 wires. From what the flow chart is saying, replace the map sensor. That why I wanted if maybe I happen to put in the wrong map sensor with the wrong values.

I had code 33 and followed that same procedure. It said replace MAP sensor. So I did and the code is gone. But I am not sure what was wrong. The engine runs OK but so it did while throwing the code too. ?? BTW I changed to an automotive GM style MAP sensor, it was about half the price.