damnit engine keeps shutting off

[88Tsupra]

well the guy i bought it from "replaced" it..buh im not sure so im gunna check it today...buh heres the detail if i warm the car up for 5 mins and drive while its half way to running temp the car makes a flutter noise as i shift and when i put it in natural it shuts off or when im in the middle of shifting itll shut off and all the lights come on..buh if its a hot or warm day i can drive it half way to running temp with no worries..im not sure if its just the cold cold weather or not..but its becoming unsafe..i almost got into an accident because of it..my steering wheel just acts like it has no power steering when it dies...also it'll feel a lil sluggish before shutting off and it takes 5min to 1hr later before i can start it back up ..if u need more detail just ask...oh and at the first start up itll back fire pretty loud sometimes then if im lucky at the second time to start it it starts sometimes it takes 5 tries