You have a problem with the EGR system, the pintle positon circuit.
The egr valve is on the passenger side of the motor. It is a round canister at the back almost at the firewall.
Looking down on the engine, the EGR valve is to the right of the rocker cover, connected to the head.
behind your trotle body on top of your intake
The egr valve is located on the drivers side of the engine on the rear of the intake manifold. Its held on by 2 bolts and has a vacuum line on the top of the diaphram.
On the driver side firewall next to the evap and brake booster
A '96 jimmy does not have a body control module (bcm), it does, however, have an engine control module (ecm) located ontop of the coolant reservoir.
The EGR valve should be located towards the rear and center of the engine. Just remove the hoses and unbolt from the engine. Looks like a flying saucer or dashpot design
i think 35mm
If you have an egr valve failure why are you replacing th oxygen sensor? Most likely the EGR valve assembly is blocked or partially blocked. Often they build up exhaust deposits on the EGR valve and ports.
Bad cylinder? Do a compression test. perhaps lack of compression in one cylinder due to a bad valve or piston. Does the check engine light come on? If so, have the codes read, they may lead you to the cause.
the egr valve is located on the back left side of the engine. getting to it is easier from underneath the car. (up on jacks). I had the same thing on a 96 mx-6. we canged the egr boost solinoid sensor located on the air intake box