I don't think the miss is frequent enough to cause a drop in temperature, it would just be one miss every 4-5 seconds and only in a very small rpm band. It went away when the engine heated up to temp. I'll try it again tonight and see what happens, may not come back?

Should I go drive it and give it an Italian tune up? If something was boogered up I didn't want to damage it by driving it.

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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap