The Mad Devil

Man,I'm Having A Lot Of Trouble In Doing The Final Big Smoke Mission "Just Business".Particularly In Bike Chase Part When Bikes And Cars Come From All Directions In The Sewer Tunnel.I Have Finished Vigilante Mission Level 16.So I Have A Lot Of Armor & Health.I Have Done The SMG Missions Too.But I'm Still Stuck In This Level And Can't Progress Further.How Long Will The Bikes Shoot After Us In The Sewer Tunnel?Is There Any Better Strategies?Would Someone Help Me By Posting The Save Game For This Mission.I Really Love The Game But This Is Just Making Me More Frustrated.Please Help.If Any Site Contains That Save Game Please Refer To It.Thanks In Advance.

Man, I Just Can't Finish The Big Smoke's Final Mission Named "Just Business" In Los Santos.Would Anyone Spare Me A Better Strategy,Cheat Or Save Game For That Perticular Mission Please.Thanks In Advance.