I have a 02 gmc lb7 completely stock that I just bought off a guy with 149xxx. He told me that he thought he’s got bad injectors so I had started it up and there was no smoke or haze. It’s sounds great and the guy said it has fuel in the oil I didn’t really notice any on the dip stick but I’m going to drain the oil out and check. Anyone else have that problem? What should I do?