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You should check the timing and plugs.
NO not that engine.
It does not have a timing belt, it has a chain.
The engine in that vehicle doesn't have a timing belt.
I contacted the Chevy Dealer and he informed me that the Chevy astro van has a timing "chain", not a timing belt and requires no maintanence action for this item.
The typical timing for a 1985 Chevy 454 is 8 degrees before top dead center. The vacuum line removed from the distributor and plugged. The engine warm and idling at 700 rpm.
That year and engine size does not have a timing belt. It has a chain and gears
It does not have a timing belt, It has a chain and it don't need changed.
The timing chain is designed to last the life of the engine.
Well, in a round about way, maybe. If the timing is that far off, and the motor is struggling to pull the load, maybe. But just running, or idling, no way.
Timing is off or fuel & air mixture is way off and it's most likely full. (due to be changed)
It does not HAVE a timing belt. It has a timing chain and it will most likey last the life of the engine.