I've got a 2010 G37S 7AT Coupe. It's just a couple hundred miles from 60k. I have alway used premium fuel and cleaned the throttle bodies maybe 5k miles ago. I've also got relatively new stock air filters. The engine randomly seems to stumble on acceleration even when fully warmed up. It's not all the time but enough to be annoying. I've run fuel injector cleaner through about 5-6 tanks. Anybody have any suggestions on what else I can try? Also I had the dealer check/reprogram trans at around 50k miles. Didn't notice a difference at all.

 

I have the same thing going on. 6spd 2010 just over 50k. It happens when I am in top gear and hit the gas to pass someone or something...feels like a stutter. I have been thinking its time for new spark plugs and wires. If that doesn't clear it up I am gonna have to take other measures

 

I've been having this problem but it's always like the day of a car wash. I have the dual CAI so I've been wondering if too much water gets in and it stumbles. I had that problem on my TL which I figured it was because the oil level was low so check oil at least...

 

Mine does it anytime..oil change or not. But I am also stock so the CAI thing aint it for me

 

Could be coincedence, but I had tough times not long after running cleaners through my TSX. I did get HFC and headers so could have been a few factors, but I ended up replacing knock and upstream sensors to fix it my problems though those symptoms were different (rough idle, limp mode)

As with everything, start with the stupid before getting extreme. Check oil and transmission fluid levels as low fluid/pressure could cause the problem.

Replacing spark plugs generally is a good idea. After that try to see if it throws any codes. Knock or throttle position/accelerator pedal sensor, reading around some people said camshaft sensor... Since you guys have autos, could be something with the tranny but probably not

 

Thanks for the suggestions guys. I just hit 60k miles and changed the oil. I added some marvel mystery oil with this change. I'll see if it cleans anything up. I'm also adding it to the gas when I fill up. Tranny fluid is good and tranny was "reprogrammed" by the dealer probably a year ago.

 

Get a can of MAF cleaner and clean the MAFs.

 

This

 

Perhaps its low oil pressure caused by the failing gasket in the front timing cover.

I have the symptoms described by the OP, but have been rather afraid to measure oil pressure and confirm this is the issue. I also notice this primarily happens between 2-3k RPM and not at higher rpms.

 

My Maf were cleaned at 50k. They really didn't look that dirty either. No sticky sludge or anything. Once cleaned did not notice ANY improvement. By the way I also have the extra ground wire kit. Doesn't seem to help either.

 

Ok. So I tried driving wth the VDC off and my acceleration was much better. I think the traction control is holding the car back a little. Its a theory, but it feels quicker and even smoother shifting. IDK...could just be me. Try it and let me know

 

My 2010 Sport Coupe 6mt does this at lower RPM's 2,500-4,000. I had an older Ford work truck a few years ago and it had the same problem. The company repair shop changed the plugs and wires and the problem was gone. I know Ford and Infiniti are like apples and pizza but both had the same symptom. I'm going to change the plugs and see if that helps.

 

A stumble could be a misfire.
Did you know our cars have a misfire counter?
All you need is a cheap ELM327 and a $9 app like torque.

 

Reset the engine by unplugging the battery.
Then drive only in DS and with traction control off.
Drive like a maniac so your car will relearn...the ways of the led foot.

Try it out if that doesnt work then I dont know...but the ECU in these cars learn the patterns of the driver. The owner before me was a douche bag that drove like a grandma and I was getting that lag...I then did the above and added a throttle controller and its a big difference now...

 

I just purchased a used 09 g37X coupe, first tank of gas, range was down to 80, car sputtered, put gas in and fine, 2nd tank was down to 88, repeat of previous, put gas in and fine, now I just filled up, range is at 340 and sputtered on way into work, would anyone know if that would be a clogged fuel filter? I plan on changing out air filters and possibly plugs as well. Any help would be great, I am new to the forum so if I have posted in the wrong place forgive me.