Alright guys, so I just changed my spark plugs on my 2012 5.0 and I started having weird issues. It’s loosing power on shifts when flooring the gas pedal, and making a weird noise, especially transitioning into second gear.

So, I checked and gapped the spark plugs because I forgot to earlier, thinking that would fix the problem, but it’s still happening.

I’m selling the car in two days and need to get the problem solved beforehand. I’ve never had any issues with this car before now.

Does...

Performance issue after servicing spark plugs