Well, seriously.
You would be mental to not replace cam seals, especially if you already have them.
Your questions are so basic and pointless, I have to wonder if you have bitten off more than you can chew.
Good on you for having a crack.
The obvious thing to do is stop guessing and get on a Dyno. At the very least get a wideband.
Before you know it you might kill your engine the way you are going.
And I vote get rid of that ecu.
Did the car ever run nicely?