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I have been struggling trying to get the 250 engine in my junkyard rescue truck running right. Idle is the biggest issue. I replaced the plugs, intake gasket, and rebuilt the carb. It still won't low idle.

I did a vacuum test and it only has 11 inches of vacuum. Sounds like a vacuum leak, but I can't find one. Then I do a compression test.

Cylinder 1-6 are 155, 155, 0, 160, 165, and 155.

Then I pulled the valve cover and found the intake valve stuck on the #3 cylinder. This looks fatal to me.