!Check engine light - P0506!
 

So here's the story. My car blew a freeze plug. So I replaced it. Long story short is the car was running nicely then it started to putt like it wasn't getting gas. I know the afr is messed up. When the thing actually starts it sounds like a v8 and puts like a v8 out of the exhaust as well

The codes I got were
PCM
P0506
IC
U1900
RKE
P0000

These are straight off my ap.

I've taken apart the entire uim and intake system 3 times now. Everything is in it's place.
Any help or suggestions would be great. Thanks