Whips89RS

89 RS 305 converted to 350 last year, read the threads, did all the correct swaps and ran great for a year. This summer I swapped over from auto to t5. Everything went great for a week, drove it back and forth to work. I was on my way home from a cruise night, pushed the clutch in to downshift and it stalled. Wouldn't idle or run after that. It cooled down a bit and I nursed it home, barely. it seems to run a little better when cold but still won't idle. As it warms it starts coughing and skipping and barely running. I got a code 44. if I disconnect the MAP it runs smooth and will idle but will not run if I put a load on it. I can cruise around like this at low rpm's if I ease into the gas. I haved checked all the vacuum lines and connections on everything else. The cat is hollowed out so I know that isn't clogged. It has a new O2 sensor. I'm looking for help as to where i should start or go from here.

1986Sleeper

Make sure you have vacuum to the MAP sensor. If so replace it. I didnt see where you were from but I have a few laying around if you want on.