i'd look at the simple things first, the parasitic draw should be easy to trace and might shed light.

I just installed a remanufactured head from Odessa Cylinder Heads in Clearwater, FL. I got this head since I had a burnt valve, the car has 240k on it so I thought it was best to go with a complete reman head. The only code I had was the misfire on #3 before replacing the head. But after installing...