would bad 02 sensors c ause the 3.9 to vibrate a bit extra when idling, and once in a while when i tap the throttle, she'll stall after the rpm's spike a bit.. iknow igotta replace my cap and rotor, think my 02 sensors went?..

 

when my O2 sensor went it idled rough and would stall the odd time. I had 200,000kms on the origional O2 sensor. but I would do a tune up first and see if that helps. and also a bad O2 sensor will give you ****ty mpg

 

if it vibrates more, it might be spark plugs. I remember wen one of my coils weren't firing one of the spark plug, idling wld suck.

 

i did plugs and wires already, ngk plugs, she'll run fine, only in idle i get excessive vibration.. plus i have crappy gas milage

 

depending on the mileage your cat could be plugged

 

ne codes? nock sensor, o2, cat, plugs wires, injector, all sorts of things

 

Sounds exactly how my truck feels. I'm throwing a code for the O2 sensor. I'm thinking the cat might be junk too though.

 

nah cant be my cat, she runs fine like theres no breathing issue, no codes either, as soon as spring hits im going to pull the o2 sensors off, either clean them or get new ones