Bought 2006 z71 suburban 250k. Has a fuel leak of some sort that a buddy is helping with but aside from that - seeking advice on this second issue, at bumps or holes in roads I hit it does the sound like door locks, check engine light flash, and the park, rev, neutral, drive tranny indicator light scales from the light on drive to a cascade horizontal left toward park. If usually 99% of time keeps going but the other day I was onboarding the highway on an old rough Texas ramp that was short and it “stalled” do I dropped it to neutral and started it and was able to regain my drivability. Need some direction on what to checklist:

ground wires (not sure where they all are)

ignition ?

transmission mount? Shifts smooth. Runs great.

Getting codes pulled next.