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I’ve seen posts similar to this issue I’m experiencing but wanted to throw out my experience. It started with noticing my car feeling like it was jumping slightly while in cruise or sometimes when I’m pressing the Accelerator. I recently notice my RPM bouncing up and down very noticeable when in cruise or any other time really. Gas Milage is horrible now as well. Got the oil changed and put fuel injector cleaner and it seemed to act better but soon (few days of driving) symptoms returned. Took it to a state park with many steep hills with speed limit of 15 and at two points when going up the steepest it felt like it was going to choke out and die but I gassed it and it went away. I drive it daily in home health and noticed it getting worse with the engine jerking couple days ago it felt like I was driving on a cobble stone road when trying to accelerate onto the highway but after pressing gas harder it stopped. took it to mechanic not throwing any codes.
 

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Hopefully the mechanic is good at diagnosing running problems. Let us know how things turn out with the car.

:welcome:
 

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Girl friend has same vehicle you do and same thing was happening. Hers had 147k miles so I changed spark plugs so far its running better one problem I notice was Oil inside the spark plug tubes which could be from manifold or a bad head gasket. But here are somethings that can cause it... Spark plugs, Coils (normally you will see rpm issues more often if its coil issue), fuel filter, Head gasket, transmission issue ie slipping. The engine is 3.6 V 6 acadia AWD.
 

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Hello, I have also started feeling very similar symptoms to this, surging, bouncing RPM, and the cobblestone-vibration while accelerating as well. Did you ever figure out what was wrong with yours?
 

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fuel pressure or leaking fuel injector(s) would be my suggestion to check. Fuel has to be a fine spray to work in the DI engine. Liquid fuel does not burn, smells like gas in tailpipe and oil. I have the problem too. Replaced engine at 80000 miles, replaced 4 injectors so far and it started again. I changed oil to get the fuel out, will have an independent ASI shop look at it since the dealer has not succeeded in fixing it long term.
 

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fuel pressure or leaking fuel injector(s) would be my suggestion to check. Fuel has to be a fine spray to work in the DI engine. Liquid fuel does not burn, smells like gas in tailpipe and oil. I have the problem too. Replaced engine at 80000 miles, replaced 4 injectors so far and it started again. I changed oil to get the fuel out, will have an independent ASI shop look at it since the dealer has not succeeded in fixing it long term.
Had the wave plate issue at 116,000 miles on my 2010 Outlook. Tranny was rebuilt and everything was fine for about 2,000 miles. Started acting like previous owners said ie... speedo jumping, tach reading erratic due to tranny shifting up and down and poor mileage. Shop checked it out and determined that a bad torque converter was at fault. Fixed under the tranny warranty free. Was still working fine when the timing chains failed at 223,000. Bought new Acadia Limited to replace it.
 

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Girl friend has same vehicle you do and same thing was happening. Hers had 147k miles so I changed spark plugs so far its running better one problem I notice was Oil inside the spark plug tubes which could be from manifold or a bad head gasket. But here are somethings that can cause it... Spark plugs, Coils (normally you will see rpm issues more often if its coil issue), fuel filter, Head gasket, transmission issue ie slipping. The engine is 3.6 V 6 acadia AWD.
Just joined I have a 12' SLT FWD With the same issues the spark plug tubes that are molded into the head are leaking into the plug wells and they will eventually fill up with oil fouling the plugs out over time only fix gm has proposed is head replacement others vaccum sealant into the area to fix this issue shade tree style.
 

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Hello, I have also started feeling very similar symptoms to this, surging, bouncing RPM, and the cobblestone-vibration while accelerating as well. Did you ever figure out what was wrong with yours?
People Suggest the wave plate but I've come to find torque converter issues in my research be the culprit.
 
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