Car question? Mass air flow sensor or O2 sensor?

C

chuck

New member
I have a 2000 jimmy 4wd. When I start up my car and go in the morning I have hesitation and it doesn't shift right. It does this about 75% of the time. When the cars warms up it doesn't do it. I've been told maybe mass air flow sensor or o2 sensor. Just had tuneup done recently so no problems there. Any info would but great. Thannks
 
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