Scolded Dog!
My H2 has about 18,000 miles on her, so I decided to take the air tube off and clean the air intake. I sprayed some carburator cleaner around the intake, and then pushed the intake open with one finger and then sprayed a little into the intake. I then took a paper towel and carefully wiped all the cleaner up, including cleaning the black stuff out of the intake. Replaced the air tube and fired her up. She now runs like a scolded dog!
I once had an Avalanche that was running rough and a mechanic told me that if you did this on your vehicle at about every 15,000 miles, it would make a heck of a difference. It did, and now I do it to my vehicles about every 15,000 miles.
I'm sure that someone can explain it better than I did, but you get the idea.
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