Rough Idle 2004 Grand Cherokee 4.7L

Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
had it to the dealer, (tune up at 40K miles w/platinum plugs) and
still when you first start the car is when it's the worst. Has a rough
idle. When the RPM's are raised it smooths out. Still averaging ~18
MPG...but the rough idle is a nusiance.

Took the car to our local service center. They could find nothing
wrong! Cleaned the throttle body and added a cleaner to the tank.
Still NO good. Wife loves this Jeep!

Hoping someone has lucked into the problem and knows the fix.
Dan in TN

On May 20, 7:31 pm, Dano <ybego... (AT) msn (DOT) com> wrote:

Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
had it to the dealer, (tune up at 40K miles w/platinum plugs) and
still when you first start the car is when it's the worst. Has a rough
idle. When the RPM's are raised it smooths out. Still averaging ~18
MPG...but the rough idle is a nusiance.

Took the car to our local service center. They could find nothing
wrong! Cleaned the throttle body and added a cleaner to the tank.
Still NO good. Wife loves this Jeep!

Hoping someone has lucked into the problem and knows the fix.
Dan in TN

This sounds like idle air control motor. These can get pretty dirty
and cause idle problems, but are easy to clean (30-min job) with some
carb cleaner spray.

See the "Cleaning the throttle body and IAC plunger" section at
http://www.wjjeeps.com/service/tbody.htm