I went out tonight to move my truck and it threw a fit. It refused to start and when it finally did it stumbled alot and blew out a cloud of black smoke. After I pumped the gas a few time it ran fine but started blowing grey smoke. I checked and the fluid levels are fine but the oil smells burnt which is odd because I checked it last week and it was fine. I searched and the best answer I found was bad floats but I have a tbi not a carb. It's an 88 Blazer with a tbi 350. Any info would help a ton.