obd2 came out in 96. so i should only have 2 also in my 95 z. thanks for the help.

 

Where is the EGR valve located, on the driver's side?
I was getting a stumble during light throttle, but now under all throttle positions. Could this be the opti? It's original non vented.

 

i don't believe the egr will give a stumble. i think it might be more of a chugging. if it is a stumble it will probally have to do with spark. the egr is on the back of the engine. it is tough to get too. even if it is not the problem, it is worth cleaning at least. go to shoebox's page and there is a picture of it.