Not Sure

[pkucan]

93 Jeep Grand Cherokee failed MD emissions (Nitrogen Oxides) but no check engine light.
Replaced O2 sensor and EGR valve.
Started up fine, Check Engine light came on, drove a mile and when I parked it, engine died..
Engine won't start or run unless I'm on the gas pedal.
Dies when I release the pedal.
Any help will be greatly appreciated!
Thanks

[Judge0275]

Originally Posted by pkucan

93 Jeep Grand Cherokee failed MD emissions (Nitrogen Oxides) but no check engine light.
Replaced O2 sensor and EGR valve.
Started up fine, Check Engine light came on, drove a mile and when I parked it, engine died..
Engine won't start or run unless I'm on the gas pedal.
Dies when I release the pedal.
Any help will be greatly appreciated!
Thanks

Did you disconnect the negative side of the battery when you changed the sensor? Whenever you change a sensor or make adjustments to a sensor you have to let the computer recalibrate for the new readings. Also, as other people have mentioned on here check the throttle body and cap and rotor. I clean the throttle body on my 96 JGC religiously so I have not experienced this issue. I would suggest starting there first. See if that helps and good luck.