Vapor lock 1990 E350 EFI 460 engine?
So about a year ago we were coming back from a 670-mile trip when we had a major overheat condition. We limped home, but I believe the heat damaged some components. I replaced the stock copper rad...
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That really sounds like a sticking EGR valve and not vapor lock. Open the hood and find the EGR valve. Once you know where the valve is figure out how to reach in and tap on it with a hammer, you might need a piece of hardwood to use as a punch. Once you figure out how to tap on the EGR valve close the hood and put those tapping implements in the truck. Next time it runs rough after a stop pull over and give the EGR valve a few sharp taps. If the idle smooths out or the truck is able to start then replace the EGR valve, they are not repairable.
