2017 Suburban will not shift after hill assist?

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danyou

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Hi Guys -
I have a 2017 Suburban with 101,000 miles. Recent problem - I am pulling out of my driveway, which has a slight incline. I pause at the top to check traffic, apply pressure to the brakes, get the hill assist notification on cluster, when I go an pull out into the street - sometimes the engine just revs and will not go into gear. Had the transmission serviced recently and got new plugs and wires as well. Other driving, transmission seems to shift no problem. I do have a RANGE AFM plugged in to deactivate the Lifters. Any ideas?

Thanks - DAN
 

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