Engine 89...starting

Still wouldn’t hurt to just go back over everything,and looking at the plugs can sometimes clue you in to any running issues you might have. Little odd problems can be a pain sometimes-but sounds like you’re keeping after it. I’m sure you will find it:)
 
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Are you losing prime in your fuel system occasionally? Maybe a leaking fuel pressure regulator. Pull the vacuum line off the regulator and see if it spits fuel. Can you tell if it's running rich?