Q: I put 44k in my gas tank and it helped a little but I can still feel some vibration.
What's the best way to get rid off carbon build up? I already tried 44k cleaning solution and it did help a little some of the vibration went away and so did the check engine light. But I can still feel some vibration. I also tried stomping on it, pedal to the medal but it didn't do much. I was also told by a friend that cylinder 4 has low psi. I already replaced the coil and spark plug but ultimately I believe is the carbon build up.
My car has 125000 miles.
My car has an automatic transmission.
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