Here is two videos I recorded of my car...
about month ago I wouldn't be able to hit redline an would only go around 6-7k rpms (only happens when driving car for more then hour or so)
Around the same time I also got a misfire code cel but then cleared it thinking it just might not happen again
Also i noticed the engine would kinda boggle when accelerating to high rpms slowly

Now in my videos I can hear burbles when just holding throttle same spot and then when u let off the throttle the needle would dip below normal idle range then back up..

You can see that the car even starts up just fine..
anyways I feel like the car doesn't pull as hard as it use to anymore. Please if anyone knows the answer to the problems I would really appreciate it. I don't want to end up buying the bhp ignition kit and end up still having the same problems.
Im starting to actually get so fed up with the car that I'm about to just sell it and get myself an ap1 s2k..

 

Plugs, coil, wires, and the cat...check those