It will start ocasionally and I just can't figure out what it is.
Mixture screw turned 1.5 turns out. Idle screw set where 3mm up.
No vacuum leaks, it's gettin fuel.

I'm out of ideas.

Figured it out- base gasket is leaking. again. time to sell it

Figured it out- base gasket is leaking. again. time to sell it

The words of a broken man..........

What base gasket are you using?

Left side peanut cover? You mean power valve cover or are you referring to your left side stator/flywheel case cover?

That's your stator cover. It shouldn't be getting an air leak from there as there is a seal on the crank and balancer. So most likely you have a leaking crank seal.

So on a scale of 1 to top end, how hard is to replace? 

Yes #20 but if you're doing one you might as well do both sides the set of them is $30 or so. Mine popped out on the same side and I just pushed it right back in. Make sure you remove the flywheel correctly and line up you stator timing marks and seat you flywheel all the way and torque the retainer nut so you don't run into the flywheel issues I ran into. If you replace both the nut that holds that gear on the opposite side is a reverse thread (righty loosey lefty tighty) so be mindful of that when disassembling to get to the other seal.

If it's not the crank seal, check around the seal, there is 3 little holes that are filled with epoxy from factory, make sure they aren't leaking. You'll know what I'm talking about when you take off the stator and flywheel