Q: 2006 Jeep Grand Cherokee 3.7l has a rough idle when stopped. I can be at a stop sign, red light, or just parked with the engine ru

asked by on February 12, 2018

2006 Jeep Grand Cherokee 3.7l has a rough idle when stopped. I can be at a stop sign, red light, or just parked with the engine running. The RPMs drop under 500, the Jeep shakes, and feels like it's going to stall/turn off. I have cleaned the throttle body, replaced the iac, and replaced the tps. I'm still having the problem, and I'm not sure what to check next.

My car has 154000 miles.
My car has an automatic transmission.

You may have a bad spark plug or ignition coil and will need to have the computer tested for misfires. If you get misfire codes it will identify what cylinder is misfiring and will need to replace the plugs and may also need to replace the coil and plug boot.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

2015 Jeep Renegade with check engine light for thermostat. Car is not overheating and has coolant. What could be the issue?

Depending on the code you got for the cooling system it may indicate the thermostat did not open in the normal time when it was supposed to open and the computer will set a code for this. The thermostat will...

My blinde spot monitor and Driver Assist are off and they will not let me turn them back on. I have two messages saying they neede

The car wash could just be coincidental to the failure or it could represent a source of water intrusion in an electrical connector and that has caused the two systems to malfunction. The two systems are electrical in nature and...

Mercedes 2006 R350 not starting.the vehicle was not started for 20 days.road side assistance visited and they said battery is good

Hello, thank you for writing in. In addition to checking the battery, you will want to make sure the battery cables are clean, dry, and tight. When the cables or ground connections are loose or corroded, they are likely going...

Related articles

A Buyer’s Guide to the 2012 Jeep Compass
The The 2012 Jeep Compass has had lots of improvements in the 2011 model, which include available four-wheel drive (4WD) and front-wheel drive models (FWD). Since those upgrades, the Compass provides good connectivity to the road and comes with an...
The Best Used Cars to Buy If You Live in a Hilly Area
Do Do you live in terrain that is hilly? Do your city streets feature plenty of inclines and declines that can be nothing short of treacherous in miserable weather? If so, when it’s time to purchase a car you’re looking...
Understanding Jeep Oil Change Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Jeep Oil Change Indicator lets you know when and what service your car needs.