What happens if you put perol in diesel car then oil as well after running it fot 1000 miles now the warning light comes on and run sluggish.if i get a flush will the car run normally again?

What happens if you put perol in diesel car then oil as well after running it fot 1000 miles now the warning light comes on and run sluggish.if i get a flush will the car run normally again?
If you drove a diesel for 1,000 miles with gasoline in the tank, then, depending on the amount of diesel you put in the tank, you may have done some serious damage to the injector pump. Drain the tank of all fuel and the fill it up with diesel. You will know very soon if damage was done.