I just did h/c/i about a week ago and had my headers/y-pipe welded today because i had a leak in the junction. Car ran great for a little bit then I got to my destination, i saw the MAP raise from its usual 65 at idle to 85ish and then died. I also got a code for MAP performance earlier.

Now, the car will turn on, run terribly and when i hit the gas it dies.

I can't figure out what is going on.

I drove in some rain/ puddles so I am thinking it might have been something that got wet.

I checked all my intake bolts and hoses to make sure I dont have an intake leak.

I did have to relocate my map sensor but I double checked the wiring on that too.

My wideband says way lean at idle.

Any ideas?

 

Do you have any software at you disposal? You could reset the fuel trims and turn closed loop off to see if you have a problem with the o2 sensors. Batt. was disconnected when welding?

 

I doubt they disconnected the battery when welding, is it possible that the pcm or something is fried? How would I know for sure? It seems to respond fine to logging and writing but its just running terribly.