Back up a minute...Do you have spark from the coil wire? (juice from coil) If so, change or check rotor and cap (wires do not all go bad at same time so unless they are wet, likely at least good enough to start engine)
I had same problem last year when I too changed the battery and had lost the code. I did a search using "radio codes" and a UK site produced the answer in a few hours for a small sum. You will need the radio serial number which is on the rear or top of the radio.
Place the transfer case in low range. Pry the shift indicator bezel out of the console using a trim stick.
Apply the parking brake and place the transfer case in neutral. Remove the parking brake trim insert. Remove the console attaching screws. Lift the console up and disconnect the 4WD indicator lamp hamess. Remove the console.
Remove the passenger side knee blocker. Remove the single end screw. Remove the screws below the glove box. Remove the screw at the courtesy lamp. Remove the ash receiver and the screws behind it. Remove the instrument panel armature screw behind the ash receiver. Open the glove box and remove the screws behind it. Lower the panel and disconnect the lamp harnesses. For additional instrument panel service procedures to complete steps 6 thru 25, refer to Instrument Panel, Gauges and Warning Indicators/ Instrument Cluster / Carrier/ Service and Repair/ Procedures. See: Instrument Panel, Gauges and Warning Indicators\Instrument Cluster / Carrier\Service and Repair
Remove the pod switch bezels on both sides of the steering column with a trim stick.
Remove the drive side knee blocker. Remove the end screw and screws located at the bottom of the knee blocker.
Remove the cowl top trim panel by prying it up with a trim stick. Remove the solar sensor if equipped.
Remove the "A" post trim panels.
Remove the remove the bolts that attach the lower instrument panel reinforcement to the instrument panel armature and remove the reinforcement.
Disconnect the park lamp switch.
Pull back the carpet at the transmission tunnel from the base of the instrument panel center bezel. Remove the nuts from the upper studs and bolts through the floor that secure the instrument panel center bracket.
Remove the bolts that secure the instrument panel center bracket to the drivers side of the transmission tunnel.
Remove the screws securing the Vehicle Information Center and remove it. Remove the screw fastening the mounting bracket.
Unplug the vacuum harness connector or vent tube on ATC equipped vehicles and the wire harness located under the passenger side of the instrument panel.
Remove the screws holding the passenger side kick panel, along with the screw from the kick panel shroud.
Unplug the antenna cable near the right cowl side panel.
Unplug the instrument panel wire harness connectors from the junction block at the right cowl side panel.
Remove the bolts that secure the instrument panel armature to the windshield fence.
Remove the nuts that secure the top if the instrument panel armature to the windshield fence.
Remove the bolts that secure the ends of the instrument panel to the cowl side panel.
Remove the nuts that secure the steering column to the brake pedal support and lower the steering column.
Remove the bolts that secure the instrument panel armature to the brake pedal support.
Place a protective cover on the seats. Lift the instrument panel off the windshield fence studs and maneuver the instrument panel out and lower it onto the seats.
Disconnect the refrigerant lines from the evaporator tubes. Make sure to install plugs or tape the ends of the lines and fittings to ensure that excessive amounts of moisture do not contaminate the A/C system.
Remove the vacuum line at the tee from the main vacuum supply harness. This line runs through the body with the upper refrigerant line.
Remove the Powertrain Control Module with connectors intact and set aside.
Remove the heater A/C housing mounting nuts from the studs on the engine compartment side of the dash.
Remove the heater A/C housing from the vehicle.
To Install the components, reverse the procedure stated above. Torque Specifications: Instrument panel center bracket to floor transmission tunnel fastener: 28 Nm (250 in. lbs.) Instrument panel to windshield fence bolts and nuts: 12 Nm (105 in. lbs.) Instrument panel to cowl side inner panel bolts: 12 Nm (105 in. lbs.) Instrument panel to steering column support bolts: 12 Nm (105 in. lbs.)
Check: - Fresh Air Intake Hose:
Clogged or Damaged FreshAir Intake Hose. - Carburetor:
Worn, Faulty or Damaged Carburetor. - Mass Air Flow Sensor:
Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit. - EGR Valve:
EGR Valve Sticking Open/Leaking. - Idle Air Control Valve:
IAC Valve Sticking or Faulty.
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Any all wheel drive will give less fuel miles.(compared to ones you engage as needed) The Chrysler v8 is a time proven engine, pretty much a copycat of a chevy with some changes to make it their own. Overall, I haven't heard any really bad stuff about them. If you look at the problems on this site, there seem to be fewer jeep probs than all other vehicles. (even though some problems are really weird!!!) What you really need to see is the vehicles history to make sure it's been maintained and has not been back to a shop for the same thing over and over. Good luck!