I think you are confusing Peyton with the Colts O-Line. If they'd given him ANY protection in the 4th, the colts would have won. It's hard to mount a good drive when you've been knocked down 5-6 consecutive plays. Where he was, and where the penalty ended up weren't really far apart. Turned a 3rd and 16-17 into a 3rd and 20. Then, when they are making a drive for the endzone, his receiver misses the catch, it gets deflected, then intercepted.
This was the worst I'd ever seen the Colt's O-Line this year. They were completely manhandled and made STUPID blocks. Don't double team a DE when you've got a LB blitzing the inside.
Give Manning a couple seconds, he'll throw you some TD's. Leave a bunch of holes, it's hard to have time to find a receiver.
EDIT: I forgot to mention, how about when they did get stopped, and punted. The Punter put it on the 1, but the coverage guy didn't evne get close to the ball. He didn't do his job, and gave it to them on the 20. Then, the Colts D allows an 84 yard TD run, after already burning one time out.
Who choked? Peyton came back to get ahead, and the D gave up MORE points to a backup Rb who made them look stupid.