Here's a list of all the cheats fro GTA 4, but some of these will disable achievements so be weary of saving your game after using them.

Enter www.whattheydonotwant youtoknow.com into any in-game computer to view maps for all weapon, health, armor, vehicles, pigeons, ramp/stunts, and entertainment locations

Change Liberty City's weather: HOT-555-0100 (4685550100)

Restore Niko's Health: 4825550100

Give Niko Armor: 3625550100

Weapons #1 (Baseball Bat, Handgun, Shotgun, MP5, M4, Sniper Rifle, RPG, Grenades): 4865550100

Weapons #2 (Knife, Molotovs, Handgun, Shotgun, Uzi, AK47, Sniper Rifle, RPG): 4865550150

Remove Wanted Level (Blocks "Walked free" achievement): 2675550100

Raise Wanted Level (Adds a star to Niko's wanted level): 2675550150

Change Weather/Brightness: 4685550100

Spawn Annihilator: 3595550100

Spawn Jetmax: 9385550100

Spawn NRG-900: 6255550100

Spawn Sanchez: 6255550150

Spawn FIB Buffalo: 2275550100

Spawn Comet: 2275550175

Spawn Turismo: 2275550147

Spawn Cognoscenti: 2275550142

Spawn SuperGT: 2275550168
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There is no cheat that will "never have the cops on you" The only other GTA game it is possible in is San Andreas. You can't put two together, Period
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