i have a 1996 cherokee sport 4.0 and it recently started to run rough one day out of the blue and ever since then it hasnt been the same... so i started to elimate wat could be wrong cause there was no check engine light on so i replaced the cps and a new fuel filter. but still does not work and now check engine light is on so i put it on a reader and it said idle air control valve and the throttle postion sensor malfunction and high volts in 02 sensor... so i replaced the iac vavle and the tps but not the 02 sensor yet.. it starts and runs rough sounds like its miss firing wen give it gas wen let off the gas idles for 10 sec and cuts off then is rough to start again. what could be the problem to much money put into jeep to give up... pleaseeee help me out

 

are tthe plugs fouled from gas

 

idk will check tomrrow but would that really cause it to only run wen on the gas and sounds like its miss firing wen on the gas too and not to idle?

 

Also, I would do the O2 sensor, a lot of people don't realize how important that part is... Good Luck, & don't give up on it! let us know, we're here to help!

 

gotrta start som where check dist cap all vacuum line and so forth

 

i had somewhat of the same problem
the check engine light came on and it threw a code that said something about the tps the iac and the o2 sensor i replaced the o2 sensor and it was back to normal

 

there is one vaccum line that goes from the back of the engine on the drivers side and runs along the top of fire wall to other side of engine and it just comes to a t and there are 2 hoses that went to somewhere but dnt know were has been like this since purshaced has never affect driving before. but has to go to something imporatant right?

 

not if ther plugged at the tee and bzeen that way long time

 

sometimes there are extra lines for options your jeep may not have come with.

 

would a bad o2 sensor cause my jeep not to stay running

 

no

 

 

how do i check my dist cap ?

 

tak the two screw loose and lift off look fo crack a lot of corrision on little metal pointsmake sure you put it back on right

 

just make sure that the contacts are not dirty or burned when you take off but their cheap so i would just replace it