I just replaced the stock factory turbo on my 2002 WRX and I also changed out the spark plugs while I was at it. Before swapping the turbo, the car would stutter and not accelerate very fast. I thought it was because the turbo wasn't spooling up to I went ahead and changed it. Now the car doesn't want to rev above 2500 rpm and also has a knock coming from the front passenger side of the engine compartment. I suspect the knock is because a spark plug issue, but what could be causing the rpm problems?
Any help is greatly appreciated. Thank you in advance.
PS: I'm not a tuner guy, I just do my own repairs, and I'm kinda a jack-of-all trades, so don't get too technical on me. Haha