2005 jeep grand cherokee limited 4.7 v8

2005 Jeep Grand CherokeeHello So I have a 2005 Jeep Cherokee limited 4.7 which I tried to install an ebay remote starter. After attempting to install the company made me connect two wires to the immobilizer wire harness. I stripped out the immobilizer wire harness and connected two wires then it sparked. I then removed the remote start and called back the company to find out the to wires went to the ignition switch harness. Now my jeep wont start at all even after removing the remote start harness. It cranks every 5 seconds but wont turn on. It has brand new battery and brand new starter. Dealer is taking to long to figure out problem. They replaced the ignition switch and added an update but jeep still wont start? HELP! I need my car.