The fix for the sticky key is to fix it as per the instructions that I'm sure you have already found here. If you spray WD40 into the tumblers it can't get to the wedge/cam area where the issue is - go ahead and try it - but you are setting yourself up for a "Dr. Phil" moment. If you let it go and it locks up, you will have bought yourself a LOT more grief than just getting in there and fixing it now, while you can.

A crank but wont start can be:

• Bad crank sensor
• Bad cam sensor
• Bad fuel pump (How's the fuel pressure?)
• Bad fuel pump relay (How's the fuel pressure?)

When you say "it's trying", I do wonder what that means. Sounds like an important clue, if it is hitting on only a few cylinders, or running lean, could be bad gas or (again) low fuel pressure.