Grand Theft Auto IV Walkthrough

Head to Asparagus Avenue from whatever location you happen to be from (since it will vary depending on where you stole the cop car and ultimately lost the cops). Get out of the car, whichever one you're in, but leave it as near to the building's entrance as possible, since you're going to go in, try to find this guy, and he's going to run off and speed off in a car. Having your own car ready to nearby will make your life a lot easier.

When Rivas makes his getaway, follow him on your HUD. He'll be represented there as a red dot. Naturally, you don't want to let him stray too far, or you'll fail the mission automatically, but understand that this guy is going to take you on a true excursion through the city. You're going to be chasing him for a good long while. Certain things will always occur in the pursuit, such as trucks losing their cargo in the road, cars swerving and the like. Keep an eye on everything going on around you. When you finally get to Bohan, the chase will slow down a bit. Start bumping your target's car, and eventually he'll flee on foot. Then, simply chase him down with your car, or better yet, get out of your car and do him in with some shots from a firearm of your choice. Brucie will be most pleased with this success!