I recently did a spark plug change on my 2015 Explorer 3.5 I have about a 120,000 miles on the vehicle. Immediately after doing the spark plug change i noticed a gas smell inside the vehicle. I was thinking that the intake was not seated properly and took it back off and replaced the upper intake gasket and reseated the intake using the proper torque sequence. I also replace the PCV valve at the same time. I am still getting the smell of fuel in the vehicle there is no obviously leak point. It is not showing any codes. I used my xct scanner. Any help would be greatly appreciated.

 

Update
I have since changed out the spark plugs from the suggested iridium plugs from the auto parts store to motorcraft. This seems to have fixed it. The plugs where making it run rich. Now I'll have to have Ford fix the leaks of exhaust into the cabin.