I was wondering if anybody has replaced their Map sensor. I'm running a PFC and I'm having some running and starting problems. I'll be checking this today and the temp sensor. Please let me know if there is anything else that I can check. The car is running very rough and very hard to start. Once started can't get it started again. I believe it's running very rich.

 

From the sound of your problem, I wouldn't think that it was the MAP sensor. However, since you have the PFC (and a large single turbo), you can use the GM 3-Bar MAP sensor which would also be cheaper than getting a new stock MAP sensor.

 

is your motor built because you might have blown a seal