Wife was jumping our 96 Jeep Cherokee Sport off and crossed the terminals on the battery. It will crank now if its jumped off but it wont idle, I have to keep on the gas. I am hoping its just the computer that is fried....any suggestions?

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I just realized we don't have an automotive discussion forum.
I would say you cooked the battery and it won't hold a charge which means the alternator is having to do provide all the power on demand.
If you jump it off and leave it hooked up to the other vehicle does it idle fine?
Fuses are all good, need tot take the battery to get it checked but it is a brand new battery (less than 1 month old) so hopefully its not messed up. It fires up when jumped off but will not idle at all, just dies when I let off the gas. I wish there was a way to run a diagnostic on the Computer because pulling the alternator is going to be quite a task.