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May I recommend sea foam to you.
I can't give you professional advice for it, but I would definitely look into it. Its a clear liquid in a can, you can get it at kragen/schucks and you can use it to clean out deposits.
You pop off the vacuum line for your fuel pressure regulator and literally suck this stuff into your vacuum system. While your engine is idling you suck up a prescribed amount, you have to let the line sip at it as dunking the line will stall the motor, and then when you have enough sucked into your engine you then dunk the line and stall the motor and leave your motor off with all of this stuff in the engine, it will be all over your valves, pistons, heads, intake runners, etc.
Then after letting it sit when you start it back up it will burn out all your carbon deposits. Just drive it hard till all the smoke stops coming out. The more smoke, the more carbon you are burning out. I know that this works because the first time I did this I made tons of smoke and the next times were less and less.
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