Dude I’m not sure what you’re saying. Did you replace all the coils, and now it is running well? If so, I find that hard to believe, unless you maybe had a spark plug wire lose or something.
Cleaning the throttle body is easy. Take a screw driver and remove the air intake tube, the tube just after the air filter. The throttle body is the valve like thing attached to the engine with a big multi-cable going to it. Disconnect your battery, and then unplug this cable. Use your finger to hold open the throttle plate, spray the carb cleaner like I said earlier. Then reverse the steps.
As far as modding your car for more power, well good luck. There isn’t a lot of meaningful mods you can really do on an 07 with out first starting with a PCM replacement, which I’m warning you will be painful experience. One of the only “good” mods you can do without a PCM replacement is put in a HV3 insert from ZZP. It is actually a pretty easy job, but does take like 3 hours.