Yes...you're tuned. Only one side holds that sensor in...the bottom screw is just there so it's not lost. Find out where the plug was soldered now. Probably under that black electrical tape. From what I see, it looks like they're crimped under that electrical tape. Make sure it was soldered and not wire crimped together. If it's crimped, solder them together one at a time with heat shrink tubing and then re-wrap.
There is also another sensor up in the intake you'll have to do this for as well. The sensor should look the same.
Yes...solder them, reset your CEL and see if it comes back. Take them apart one at a time and solder them. This has been a known issue for the P0101 since they first started doing the GMPP tune. I waited and I actually have plug'n'play adapters for mine.
Yes...that was also in the link I sent you. However, those crimps, if not the problem now, will be a problem in the future. There are several different things that can be causing your issue. The largest are the crimped MAP sensor wires. Second can be loose intercooler piping. If you have these clamps, that's not your issue.... if you do have these (pr the other style, tighten them anyway...