my 95 z28 has two cracked exhaust manifold from what i was told by the dealership. is it possible for me to dirve the car like that until i get that fix. also the car stumble at low rpm could that have anything to due with the cracked exhaust manifold. i do you know if you have crack manifold for future reference. i never knew both of my manifold was cracked. i took my car to the dealer an had them to run a dianostic on it about the stumbling. they tell me that i should fix the exaust first and then worry about the stumbling later because the car did not stumble when they tested it.

 

I doubt that a cracked exhaust manifold will affect performance in any way, unless it is causing anough noise to diturb the knock sensor.. What you probably need is a plug and wire change to correct the stumble.