My 1996 jeep grand cherokee will not start i broke down on the road and had it towed away, they called me and told me it was the idle that got reset, so i went and picked it up it ran for a day then it quit running. it cranks and has spark but it will not fire, does anyone know what the problem might be

You need to have truck ABS scanned.

30 below,wow,jeep can't handle it...too burrr-cold...

THE BEST WAY is to locate 2 or more points that seem sturdy. nothing plastic. your best bet is hooking the cables up to something underneath the car that is attached to the frame if not the frame itself. Remember that you want to do it right in the middle of the car or 2 points on seperate ends to have an even nice pull

defective ignition coil or broke wires at the coil

CHECK FUEL REGULATOR ON FUEL INJECTOR RAIL,&ALSO FUEL PUMP, CHARLIE

Possible, But it should idle with the jumper cable hooked up. after charging the battery, does it start on its own?

check the wires to the fuel pump if they have rubbed against something and the insulation wore through hitting bumps or rain could cause it to short and kick the relay and resets again and will start

possibly a sticking idle air control Mtr also known as IAC motor

Did you know Jeep did a recall and paid for replacement of catalytic converters on 1996 models (don't know about any others) - they reimbursed me for work done, up to a point - hope this helps!

you might want to have the fuel pump looked at. have the fuel pressure tested at idle and while driving