Van runs rough while in park and revving engine to about 2,500 RPM's

Hi,

This is most likely because you have fuel in the vapor canisters. The way this works is that these canisters hold fuel vapor so it is not emitted to the atmosphere, reduces emissions, and it improves fuel mileage.

When these get fuel in them from overfilling the tank, the purge will pull in the fuel and it will cause it to have a rough idle or even stall especially after filling the tank.

I would remove them and see if there is raw fuel in them. If there is, I would replace both canisters and the purge valve because when these get fuel in them, the charcoal breaks down and get pulled into the purge and will cause them to stick.

Let me know what you find and we can go from there. Thanks