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How long since a tune-up? Has your Sierra been parked for awhile? Dirty gas, add Lucas Oil Injector cleaner to gas tank...water in tank, add Liquid Heat...dirty air filter, replace and clean out throttle body...Idle Air Control valve...spray, wipe out with rag...also spray the MAF sensor with special spray ONLY...injector spray erodes the sensor finish...:(
Clean mass air flow sensor with a nonchlronated brake cleaner,install new air filter and check all vacuum lines for leaks then check for vacuum leak around or at intake manifold.Code P0140 is for mass air flow sensor code P0300 is a multiple misfire which more than likely is a vacuum leak possibly intake manifold gaskets leaking.
The blower motor is on the passengers side under the dash.You might have to remove the a lower panel.This is the insulator panel.If the blower works at all just turn it on and follow the noise.Hope this helps.Good luck.
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