I switched to the map sensor in the L26 upper intake manifold by wiring in the different connector and capping off the nipple on the upper intake manifold. the check engine light came on and the code is P1635 and another P0463. the P1635 is a 5 volt referance for the maf, map, throttle position, and fuel level sensors. the P0463 is for the fuel level. The map sensor is reading, and the reading stays about 54ish.

I'm wondering if my pcm is acting funny or I wired the connector wrong, or the splices are creating too much resistance for the pcm to accurately read the data.

the other thing I did, really just out of curiosity, was to connect the nipple on the upper intake manifold to the nipple on the throttle body. when I did that, the car acted like it had a vacuum leak. not really sure why. car went back to normal when I plugged the nipples.