Q: Carbon buildup

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my car was hesitate when start to go codePO3oo read misfire so i changed spark plug and coil run good for 1 day and hesitate again check new plug only passenger side three plug are showing carbon build up took to shop told me that throttle body is bad????that is case all 6 plug could build up carbon????

My car has 90000 miles.
My car has an automatic transmission.

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