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Re: Truck running poorly under load, need help.
When disconnecting the vacuum line from the distributor you need to plug the port at the carburetor. Your picture shows a piece of open vac hose which should be producing a vacuum leak. Normally you would noticed a change in idle when having this port open. You should also see a change in timing if connected to manifold vacuum and when disconnecting unless the vacuum can is bad.
You can test this by applying vacuum to that distributor can using one of those Mityvac hand pumps while the engine is idling. No change obviously indicates the can is not applying a change to the distributor advance.
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