Have Jeep Questions? Ask a Jeep Repair Expert for Answers
Hello. Welcome to Just Answer. Please allow me to assist you. This is a common problem on these vehicles. The idle speed is actually controlled by a devices called the Idle AIr COntrol Valve. This unit moves back and forth as commanded by the computer. The more it moves towards the open position, the more air is admitted to the intake manifold. This additional air increases the idle. If the valve is faulty, dirty (carbon buildup is common), the valve does not move properly. This is what causes the engine to shake at idle, the valve is not opening to where it should be. Cleaning the idle valve is possible, but, since this is an older vehicle, I would recommend replacement of the valve. The recommendation I have for you on this issue is to go to a Jeep dealer parts dept and purchase a new Idle control valve and install it.
If you have any questions, please feel free to reply.
Thanks for choosing Just Answer. It was a pleasure to assist you today. I trust my input to your request is satisfactory to you and meets your expectations. A positive rating would be greatly appreciated for my assistance on your inquiry.
Thanks in advance and thank you again for choosing Just Answer
That sounds like a sticking throttle plate. I would recommend a throttle body cleaning in conjunction with the idle valve replacement