2002 Chevrolet Suburban First Gear Reving High Before Shifting This Only

2002 CHEVROLET SUBURBAN
256,000 MILES
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First gear is reving high before shifting. This is the only shifting that is a problem, thought it may be the transmission, but after having a reputable shop check it, they said it is MAF sensor, or a leak. Changed the air filter, and looked at MAF, and it looked clean. But, problem still persists. Suggestions please.
Oct 25, 2012 at 1:34 AM
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HMAC300
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check for hoses off or holes in them anywhere on engine. check the duct work to make sure it is all connected from maf to throttle body, check for a vacuum leak if this is a big block-8.1L check to see if intake bolts are tight they shold be 44 inch lbs or 5 Nm
Oct 25, 2012 at 2:39 PM
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