turbocdubs

So I go to get my truck tuned. (truck wasnt idling and running like *** esp under load). So we logged it and the map wasn't reading at all.

So we tried another sensor we had on hand that was working tried that no luck.

So next step was to test the wires.

A- Orange/Blk (Low Reference / MAP Ground) C1-54

B- Light Green (Map Sensor Signal) C2-32

C- Gray (5v Reference for Map Sensor) C1-48

The low reference checked out

5v Reference was perfect

Jumped the signal wire from 5v and the signal wire read 5v and maxed the map signal readings as it should.

So why does my map sensor not read when running.

I want to say it read properly a few times on key-on.

but nothing reads anymore could my pcm be going bad or where should i look? Bad/failing pcm ground?

I'm seriously lost.

any help appreciated.

when i first wired the motor up the motor fired and drove but not perfect. but really wont run or idle now. idles a smidge better when hot but still doesn't run worth a crap.

turbocdubs

Update: i pulled the map connector off to see if it was bad or a bad connection. and what i found was when i ground the map sensor it no longer reads regardless of vacuum. what does this mean?