Hey everyone, I have been searching an searching and searching til Ive been blue in the face lol trying to figure out what to do about my jeep issues.... lol
Alrighty, here goes...

I have a 1999 Jeep Cherokee, Inline 6 with a 4.0L... i have about 246,000 miles on it...
So The skinny is when i am driving... say 45mph to about 65mph or so.... I get this shaking/stuttering feeling.... I have to either press down harder / accelerate more or left off the gas completely.. I cannot just hold my speeds in that range... or i get this shaking. Bad shaking at that.. Also, I get the same shaking when at a red light, or even in park. I have done some trouble shooting, and this is what I have done...

I have.... replaced the spark plug, spark plug wires, distributor cap, rotor button, ive replaced 2 vacuum lines, and for laughs.... I put some ... multi i should say cans of fuel line cleaner/injector clean in my fuel line. As of this morning, well early afternoon ..say about 11am... I had a fuel test down and it came back find, so i know at least my fuel pump and fuel filter are ok.This last week my engine has tried cutting off on me a couple times while on the interstate and i had to press/jam the gas pedal 2x or so to get the jeep to wake up and resume... not what i would call fun times, but it did come back to life each time it happened within a second or two at that.



the error codes I am getting are...
P705
P1494 ( I cannot figure out what to do about this one as well in my case) ( I have replaced the Evapa-solenoid and its not making the "clicking" noise its suppose)

** and of course the code for the 02 sensors as Jeeps are notorious for those going bad...


One guy at Auto-zone said it might be bad computers but i doubt that my CPU's could cause an engine to run this rough.... just my thoughts, i could be wrong though.

I am new to the forum(s) and I am just hoping i am posting this in the right place, lol

 

Just guessing...O2 sensor?

 

i didn't think an 02 sensor would cause those kind of issues.... has that been known to cause issues like that?

 

I had one go bad and it threw all kinds of codes and made the Jeep feel like it was misfiring and/or just idling terribly. It would happen at different RPMs. I broke another one while wheeling it is just ran like I pulled out three spark plugs until I replaced it. It's hard to say, but I know a bad sensor will **** off the computer and lead it to think something else is wrong.

 

Your computer absolutely could cause the engine to run like complete crap.

I'd replace the O2 sensors to start with if they haven't been done in a while, as the previous posts suggest, and go from there.

 

I'd troubleshoot the P0705 code. I think thats a tranny range sensor code. I think there is a connector you can clean to remedy that. At work at the moment cant research. See what info you can find on the P0705. O2 sensors doesnt cause a vehicle to shake badly usually.

 

A bad upstream O2 will cause it to run poorly. Also it could cause it to stall driving at a steady speed. Usually when it's about to stall letting off the gas or flooring it will keep it running Ning. It may also backfire through the intake at times.