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The salesman told me the previous owner was a mechanic. I took that to mean the car was well taken care of. Now I realized it probably meant the guy realized there was a problem with it, did something to make the check engine light go away, and then traded it in sneakily.

Final verdict: car has two dead cylinders and will require a motor rebuild or a junkyard motor. Since I haven't owned the car very long the dealer has agreed to do an exchange.

Update: mechanic just called, two cylinders are now misfiring. He thinks it's a bad intake manifold gasket. Currently coordinating with warranty company to do the repair.

Update: Took the Mountaineer in for new spark plugs. Didn't feel like doing them myself in case they broke, which I hear is common. Mechanic said after replacing all the spark plugs, NOW the car is showing a check engine light for misfire in cylinder 4. New ignition coil and new fuel injector...

Huh, interesting. I live in North Jersey too, although Mahwah is still a hike.

Hypothetically if I went to a mechanic to have my spark plugs and/or coils replaced, what kind of cost am I look at? I know from past cars that I often would think "transmission problems" but it was something entirely different, like a bad MAF sensor or a software issue. So hopefully this is...

It wouldn't be the end of the world for me if they said I needed to replace or rebuild the transmission as my trans is covered under warranty for another year or so. Side note, the mechanic (not dealer) charged me $385 to do the trans flush. Seems insanely high, right? 6 quarts of Mercon SP...

Well, after a weekend of driving, I can say the transmission fluid change did not help at all. I checked and they did put the correct fluid in. However, driving on the highway the car felt like an earthquake every time I approached 45-50 mph and it wanted to change into the next gear. Once again...

The invoice said OEM Mercon fluid.

Thank you everybody for the advice. I had the trans fluid, filter, and gasket changed out yesterday. I no longer notice the inconsistent acceleration at low speeds while the engine is cold. It accelerates smoothly and drives better now. I haven't yet driven on the highway so I can't comment on...

Thank you, I will take it in to my mechanic today, have him look it over and go ahead and replace the transmission fluid. Since the check engine light is off and there are no codes (no pending or stored codes either) I don't believe it is a misfire issue.

No error codes whatsoever. I bought the car somewhat recently so I have no idea what the maintenance history is. No clue when the transmission fluid was last changed or any of that.

I did some searching but I don't know much about cars so I don't know if the posts I read described the same problem as mine or not. I own a 2007 Mercury Mountaineer Premier AWD V8. The car has 67,000 miles on it and I am the third owner. When starting out in drive while the engine is cold...