Been lifting for about 4 years now (since highschool).

Would say I have only put 2 years of serious lifting in though since most of my high school lifting was learning form and bullshitting around with football team, etc.

My question is if I am overtraining or doing to much and if I should try a different split?

Currently:
Mon - Chest/Bi
Tues - Leg/Shoulder
Wednesday - Back/tri
Thursday - Rest
Friday: Chest/Bi
Sat - Leg/Shoulder
Sunday - Back/tri

Stats:
Ht: 6
Wt: 170
Max Bench: 260
Max Squat: 365
Max DL: 315

Basically I am hitting each muscle group twice a week. I do a consistent 4 workouts per muscle group so usually 8 in total and do abs every other day or ~2-3 times a week.

Reason I am unsure about my workout plan is because for the past couple months I have been stuck at the same weight and cannot seem to break the barrier.