Why would my mini van shudder while idling, and jump while its moving?

Why would my mini van shudder while idling, and jump while its moving?

Why would my mini van shudder while idling, and jump while its moving?

Posted: 14 Sep 2012 06:04 AM PDT

I have a 2008 Chevy Uplander, and a few days ago it would act like it was about to cut off while i was sitting at a red light. Then it would do it more and more while I was stopped, now it's jerking while I am driving. There are no check engine light on or any other indicator going off while this is happening. The only thing I can think of is that I bought some cheap gas that probably has not cycle all the way through. I also think that it might be a spark plug problem.. I just want to make sure before I go and take it in, I do not like taking my car in without having some idea about what is going on since most service departments try to charge me more for things I do not need. Thank you.

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