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Made a lot of progress today. I temporally capped the brake booster line, and that did the trick! Turns out, booster had a leak, and that was causing the last 2 cylinders to get leaned out and not run. I completely over looked this a few times... I am having a problem getting the manifold gasket...

The firing order should be correct, I checked it twice. Going to check the vacuum lines, one in particular going to the brake booster that I am starting to suspect (the only obvious thing I have overlooked). The engine is a Hercules JXD. Looking forward to hearing back

I have been asking around about this issue I am having with my scout car, and I am hoping I can find the answer here. My scout starts up and runs smooth, but the 2 most rear cylinders (the 2 closest to the firewall) are dead. I have a good strong blue spark on all new plugs, timed correctly...