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.

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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Magic Mechanic
1432 Lee Road OrlandoFL32804 USA 
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