Trouble starting and smoke

[bammax]

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.

 

[bammax]

I guess nobody has any ideas for me. When the snow melts I'm going to replace my fuel line which is rotted along with an oil change and filter and possibly plugs/wires/cap and see where that gets me. If those don't fix things then I'll have to assume it's the throttle body.