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The check engine light came on while driving and the van started running rough, ie revs fluctuating from around 600 rmps to 1200 while idling and it will stall if revs are not increased by keeping foot on gas. When up to speed, it seems to run fine. Just had a tune up done a few months ago, new spark plugs etc. It does have almost 125,000 kilometers on it. Any idea what the problem might be?