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I have a 2014 Ford Fusion SE FWD with the 2.0L turbocharged ecoboost engine. The transmission seems to stutter in third gear under heavy acceleration, but doesn’t seem to happen with normal acceleration. I have noticed that it only becomes an issue in third gear and has never happened in first or second gear. It usually occurs somewhere around 60 mph or about halfway through third gear, but i think the revs and current gear are more important to the issue than the speed. Yesterday, I tried leaving my foot glued to the floor while the issue occurred because I was curious what would happen since I usually just let off the gas and accelerate calmly and to my surprise, it happened until the engine issue light came on and flashed for about 20 seconds before going away and turning off completely. The light did not return, but the issue has not been resolved and I can only assume it would happen again if I tried, but I don’t want to damage the car. I think I noticed a slight cut in power after the engine light started blinking, but i could be wrong. Though, whatever cut in power I may have felt went away after the light stopped blinking. My car has been doing this for a couple months, but I try to avoid causing the issue to happen as to not damage the car. I must also mention that the car has not always done this in the two years of ownership. This has only been an issue in the past couple months and I change my oil and oil filter regularly as well as having no other issues with the car except for this. If anyone knows what is wrong or has a theory as to why my car is doing this, I would greatly appreciate a reply. Thank you. :) IMG_3809.MP4

I have an '09 3.0L v6 auto trans with 184k miles. I bought it seven years ago, CPO from a Ford dealer at 34K miles and it's the most reliable car I've ever owned. Can runs well, but just developed an acceleration hesitation: If I'm cruising, then step on the throttle, at 1700 to 2000 rpm, the engine hesitates. after that it's fine. It doesn't do it all the time. when I think the issue is gone, it shows up again. then it's hard to replicate the issue. The air filter is fresh and clean, and I recently cleaned the MAF sensor with the correct spray and replaced the PCV. It seemed to help a little the issue is still there. There is no Check Engine Light on and the car is consistently getting great gas mileage and pulls as strong as ever. What is this? My guess is it could this be an O2 sensor issue. Even if it's not, I'd love to change them. Is there a video or photo of the O2 sensors' locations? thanks