I have a 2006 f150 4.6, a couple weeks ago the code came up for the fuel cap so I replaced it, then yesterday it came back on and it also had a code for a vacuum leak. I found a hose from the fuel tank to the evap canister that was unhooked so I put it back. Now my truck barely starts and won't idle, it spits and sputters and then dies if accelerator isn't constantly pushed. The new code it's throwing is p2196. Any help would be greatly appreciated

 

I believe that P2196 is trying to tell you that the o2 sensor for bank 1 is stuck rich.
You might try replacing that O2 sensor. If possible use one from Ford.