To anyone having a problem with the invincible carrying over to human a.i. Have an area cleared out that you can go back to later on(Like the first mission when you have to find tools to fix the fence the first time)... Take whatever crew that doesn't have the 1000 health, bring them there, search around to make sure there are NO ENEMIES(Zombies and ESPECIALLY HUMAN AI)... After clearing the area, then enable the inf. health cheat! Switch each player and there health will then be 1000! Now turn Inf. Health off!! TURN OFF!!! Otherwise, it will go on to any human AI you encounter in another area!
Now, rinse and repeat with any other allies of yours! Go back to cleared area, turn cheat on, switch to every member in party and BOOM! Everyone is at 1000!!
Again, make sure you only do it on a cleared out area, and make sure to turn it back off!!
Also, inf AP is giving me a problem, so I won't use it! a.i. zombies AND humans get it as well, so not worth the hassle!
Take care,
Mikey