I am new to this so forgive if there is another thread about this same issue, I have a 1998 jeep cherokee sport 4.0 with 270k miles, When driving aprx 50mph and give it some throttle it dies out. If I slowly give it more throttle it will go to 3000rpms and bounce like as if it were hitting rev limiter. if I let if and put it to the floor it will shift down and go fine. Only happens in drive and mostly uphill. Since this has been happening it also will idle very rough and the motor knocks, not constant just random throughout throttle. I know I have a bad 02 sensor on the manifold but I don't really have the money to buy parts it doesn't *need to drive. Thanks for any help and sorry bout the long post.

 

I would replace that o2 sensor

 

Check Engine light on? Any codes?

Last time the transmission fluid was changed?

 

A faulty O2 won't limit the revs like that. Sounds to me like a CAS issue. Either way, a code would be thrown. Go get the digits and google what it's calling out.