Hello everyone my name is Henry I have a 2020 Honda Civic sport hatchback 6-speed manual.

 

So I'm having an issue with my 2020 Honda Civic sport 6 M/T , 1.5L Turbo. I just recently replaced the transmission and it was working great . I drove about 100 miles and all of a sudden when getting in the car it was acting fine on start up and idle and while driving in gear, until I hit 3500rpm it started sputtering, so I shifted to 2nd and sure enough the same thing happened at 3500rpm exactly. Then so on and so forth every gear sputters at 3500rpm. Any help would be wonderful, thanks