Car Information:
GMC/Denali
Year: 2002
Engine Size: 8 Cyl
Trans: Automatic

Issue / Question:
If I very gradually accelerate it will shift into the next gear. If I try to accelerate more quickly, when it tries to shift, it goes into neutral, the engine revs and I have to back off and gradually press on the accelerator and give it time to make the shift.

Answer:
I would try a 1-2 shift solenoid then take a pressure reading and see if I’m loosing pressure. I think the solenoid may fix it because if it holds pressure after you go light throttle then reapply, it sounds like it just needs more time to pass fluid through the solenoid like it isn’t opening all the way or is restricted.

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