why would changing my battery all of a sudden alarm me that my map sensor is bad

Well it also takes a while to start n then with the air on it idles. I had no problmes before until i needed a mew battery and now all these problmes could it be the computer needs to be restarted?

Anytime the battery is disconnected, it's common for idle problems to arise as the computer has to re-learn the idle strategy again .. However that should not cause the issues you are having... IF you think it's a chance the cables touched the wrong battery post .. *TEST* ALL FUSES using a test light... A blown fuse can cause this! Good luck with it!