I was driving home though the mountians in western MD after delivering a car, and I was following a late model GMC pickup for a few miles. Speed was around 75 mph down the hills and I assume he was coasting because I was too. Everytime he got to the bottom of the hill I see a large puff of smoke as he got on the gas. There was no smoke while going up the hills as if there may be worn rings. What causes this?
Orignal From: What causes an engine to smoke like this?
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