I recently purchased a 1999 Jeep Wrangler. The person I bought it from said the motor was replaced with a 2003 motor. I'm trying to replace the spark plugs but am uncertain of which plugs to buy since I'm not 100% sure what motor is in the Jeep. It is a 4 cylinder with a distributor. Is there a way to tell if its the 2.4 or the 2.5? Any help is appreciated so I can get the right plugs.