I recently had quite a few problems with my 91 z28. I ended up changing ingition coil,distruibutor,ignition module,rotor and cap,and on top on that my fuel pump went out. So I bought a walbro. Now I drive the car for about 20 or 30 mins, and it starts to run rough. After a while the SES light comes on and it gives me a code 13 for the O2 sensor. So I went a bought a brand new Bosch sensor. I still have the same problem. I still get the same code on the ECM. I searched the threads with no luck. Does anybody have an Idea? I have the Scanntool, so I can read data from the engine. Any help is greatly appreciated.

 

Anybody!!

 

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