No problem!

Yes, add a bottle of Chevron Techron fuel system cleaner in the gas tank. Do not use anything else, this stuff works and is the same GM product at the dealers, just a GM bottle. I suppose you could get it there too if you cannot find it in a store.

BG44 is also good but is more of a carbon remover, not fuel system cleaner but I am pretty sure BG makes a fuel system cleaner too.

You could also change out the fuel filter. It is located under the car, rear drivers side. Being a 99 like mine, it may be rusted onto the line and need to be cut off, like mine!

I would start that route and see if the condition goes away. It is cheap too!