running rough on the big end

2002 PONTIAC MONTANA
220,000 MILES
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MITCHEMX5
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My minivan is a 2002 Montana Pontiac with 220,000 miles. Tune up 2 to 3 years ago. Runs great. Just beginning to "chug" and hesitate in acceleration around 40mph and beyond. Consistent hesitation and slight but noticeable "chugging". MPG appears to be fine/average. Possible gas flow problems? I can change the gas filter....but WHAT do you recommend for cleaning the injectors/gas line?....."IF"...that's the problem. ??? Any other suggestions of what it could be?
Aug 29, 2011 at 12:29 PM
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DOCFIXIT
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Check engine light coming on?
Aug 29, 2011 at 1:17 PM
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MITCHEMX5
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no check engine light.
Aug 29, 2011 at 2:31 PM
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MITCHEMX5
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I did add some Lucas Gas treatment about a week ago....that's every now and then...not consistantly.
Aug 29, 2011 at 2:34 PM
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DOCFIXIT
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Techron by Chevron very good injector and valve cleaner also clean MAF sensor in air snorkle. And clean throttle body this will help overall performance
Aug 29, 2011 at 3:00 PM