Golf IV / Jetta IV :: Won't Rev Above 3100 Rpm In Any Gear

Over the past couple weeks sometimes when i turn my car on it wont rev above 3100 rpm in any gear. The car is a 5-speed jetta 8v 2.0 and I'm just looking for any insight as to what is causing this problem. My check engine light is on and i had the codes read and there was a bunch, "catalyst system below threshold bank 1", " ignition coil A,B,C,D circuit primary/secondary malfunction", and "camshaft position sensor "A" circuit high input". I'm not sure if these codes are related to the problem but i had to have the whole top end of my engine rebuilt not even a year ago and all of the ignition coils and sparkplugs were replaced during that time.

This problem does not occur every time i turn the car on however, i did notice that sometimes when i go to turn the car on instead of the car starting in quickly, it will start hard after sever cranks and this is usually when i have this issue. it is very weird almost like there is a rev limiter on and i can usually fix the problem if i get up to highway speeds and downshift hard into 3rd and the car will shudder once or twice and will drive like normal again. What could be wrong i was thinking it might be a bad O2 sensor or a vacuum leak somewhere.

Just to clarify what i mean by it wont rev past 3100 rpm i mean that i can start from idle and accelerate normally and when it gets to 3100 rpm the power goes away and will just stay there even i put my foot all the way down. I can shift up and the same thing will happen i will accelerate normally but then once i reach 3100 rpm again it will stay there.