Hi:
If you're not getting any codes and have had it tuned, I would start looking for a vacuum leak. Check the vac hoses for damage, cracks. Also, make sure there is no issue with the intake gasket.
Let me know what you find. Also, the 2.4L really is too small for the van's weight. Don't expect too much as far as power.
Joe
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Thursday, November 27th, 2008 AT 9:38 PM