Charliebrown23

i have a 91 cherokee 4.0 when i start my jeep up it has a real low idle and the jeep will shake sitting still and when im going down the road its a real horrible shake someone please give me ideas why this is happening

Timber Wolf

Hey Charlie, welcome to the forum. Now for your problem. I have a 91 XJ that on extremely cold mornings likes to shake when I first start her up. Now as far as I know these jeeps like to run at about 200*. So I let her run for about 15 minutes to warm her up. After she reaches temp she behaves quite well. Please go into a little more detail about your warm up procedure. We might be able to help a little more.

Charliebrown23

i will start the jeep up and it idles around 800 then will rev up on its own then die down again but im more worried about the vibrations

TrekkerJmm

Sounds like you may have a miss either by vacuum leak or maybe a bad plug/wire...Tj

builtnotbought89'

Use our search for "throtle position sensor" (TPS) to get info on the high idle problem also replace the O2 sensor! Those sould clear up the rough idle, & as for the shaking start by checking ur motor mounts to see if they r shot!?!?