Jeep Repair: 2004 Jeep GC, jeep grand cherokee, auto repair shop

Question
I have a 2004 Jeep Grand Cherokee, the problem is it reads the third fuel injector has problem. I changed the spark plugs and  the number three fuel injector. The engine is sputtering and gas and white smoke is coming through the exhaust. i think its the computer.... need help? THANKS!

Answer
The best thing to do is to have an auto repair shop diagnosis the failure. There may be more to the problem than just replacing the computer. There may be wiring issues or it could even be unrelated to the computer.I'm sorry that I could not be of much help but to avoid any headaches a repair shop is your best bet. Thanks.