Hi:
The IAC or the throttle position sensor (TPS) could cause this. However, I would think it would kick the check engine light on. You may want to take the van to a nationally recognized parts store and have them scan the computer for codes. Most stores will do it for free. If nothing is found, you may want to test fuel pressure to see if it's where it needs to be and steady. You may want to check it before and after the fuel filter.
Let me know what you find.
Joe
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Monday, February 25th, 2019 AT 7:07 PM