so i was driving today and the car seemed fine on local road...then i took it to the highway and getting on to the highway was hell...trying to hit 9k at first seemed to be bogged down and heavy...2nd gear wouldn't hit 9k like it literally stopped at 8700rpm...then when i tried redlining 3rd it just stopped at like 7k....WHAT THE HECK IS WRONGGG WITH MY CARRR?!?!?...i've searched and read some other similar threads and i'm thinking it might be a bad cat or the ignition coils....anyone have any ideas on what else it can be?

 

Cat Converter is plugged.

I've had 4 replaced in 35K miles.