Do I have bad fuel injectors or fuel pump on my '92?

[Nacho_ZR1]

So I barely purchased this car a few days ago. I've only driven it pretty hard through gears 1-3 since I've been waiting to do an oil change and tuneup next weekend.

A friend of mine wanted a ride earlier today so I took the car to a very dark quiet street and took off. The car pulled very hard in first gear and began to fishtail around 6500 rpm so I short-shifted into second gear and kept going. Everything was fine until I let off the gas and made a U turn to come back home. The car was idling extremely roughly and it was sluggish to get through the gears. I took her home and let it sit for a few minutes. When I tried starting the car back up, it cranked for at least 10-15 seconds and a big puff of grey smoke came out of the exhaust. I am afraid to take the car for a spin again and not sure what to think. Bad fuel pump or injectors? Am I off base? Not sure if the delaership put in a fresh tank of gas or if it's still the old gas that was from the previous owner.

Not sure what to think but I'm hoping you all have seen this before?