Help with a sirloin tip roast

That my friend is better known as a tri-tip. You will get a lot of different ideas on how to do it, but here's how I do mine.

Smoker at 225 degrees until it reaches 115 degrees internal. It then goes on a very hot grill where it gets a good sear on both sides. I might baste along the way with a 50/50 mixtures of melted butter and BBQ sauce (or A1 Sauce)

If you try to do it low and slow the whole way you will have shoe leather. Don't try to pull it...

Your mileage may vary...