Car Information:
GMC Acadia
Year: 2007
Engine Size: v6
Trans: Automatic

Issue / Question:
While driving between 40 to 70 or 75 the engine sounds like it went into neutral for a split second, the rpm will spike to 3000 sometimes it will do a double event and jump to about 4000, all in about 1 1/2 or 2 seconds. Dealer says it’s just the way it is calibrated to get efficient gas mileage.

This can happen on level highway and not while depressing the accelerator.

Answer:
Don’t want to argue with your dealer but how would an engine racing at 4000 RPM help with fuel economy? Sounds like the transmission is intermittently starving for fluid and slipping, I would check the fluid level. If full, I would drop the pan and see if there’s a leak between the filter and pump.

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