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Thanks everyone for the help. Im sure it is the overflow tank.

The wasted and broke ramen would be a big hit with college students. Wash the soup for sluts ramen down with some smooth vergina beer then try a Finger Marie. But stay away from the Barfy burger. It's a "flow pack"

I vote for coolant overflow...

It's very easy to test for plugged radiator, as posted previously. But you tested it yourself, saying temp was normal running on the road. If the radiator is badly plugged, how could it possibly run at normal temperature on the road, on a warm day? Besides, 185F is normal. Sounds like your thermostat, water pump, and radiator are fine. Blocking heater bypass loop will bring temp down somewhat, but won't fix your problem since 185F is normal. A car running too rich will sputter and stall at idle or low rpm, but run OK on the road at medium rpm. Plugs will get black. Vapor lock or water temp can't make plugs black. According to ZTherapy video (hidden in the British SU section) fuel pressure can affect the mix (more = richer) so that could possibly cause rich condition, as posted by others. Otherwise, I guess something to do with carbs: they look new, so probably mix setting. The caps are freeze plugs. They look new. Digression: My mom hired a guy to fix her truck. It was driving really wonky. I crawled underneath and saw that he had loosened the bolts to the cross member under the transmission. I tightened it up and told my mom but she wouldn't believe me, and she paid him soon after for even more useless repairs.