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If compression is ok, probably a bubble in cooling system. To clarify the previous post--there are 2 air bleed valves in the frunk, one's on the top of the radiator, and one's on the heater control, behind the spare tire and interior panel in the frunk. The car came with 2 clear hoses that fit these air bleed valves. You put the hose on, elevate it above the level of the radiator cap, and open the valve until fluid comes up in the hose. Should be about 3 turns. The BGB says open these 2 valves and add fluid to the rad cap until it's full, then put the rad cap on halfway, run until warm, and repeat until there are no bubbles.
My recent experience--there's another bleed valve sitting above the transmission, that's where most of the air comes out. It should have a hose going to the overflow tank, if you're lucky that hose will still be clear enough to see the fluid level when you open the valve. Your best bet is open all 3 valves, fill rad cap, start the engine, and run it--heater on--and add water at the rad cap until there are no more bubbles. Then seal it all up.
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