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I got an 87 z31 na. And right now, in order to get my car to operate normal for a short period of time I have to unplug the fuse to my fuel pump and plug it back in after about 4 seconds. I have replaced the pump, fuel filter, plugs, cables, and got a FPR from the local pull a part. I also replaced the o2 sensor
When I go to accelerate my engine bogs and stumbles very bad, then I take the fuse out and plug it back in, and things run smooth for a short period of time. I have ran the diagnostic codes and I get the fuel pump circuit code, but I thinks that is vague since it could be anything with the fuel system aside from the injectors.
I am brand new to working on cars so I dont know much. But I am willing to learn if anyone can give me some insight on what this might be.
 

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go to www.xenonzcar.com and read up on the Z31 section. Also download the free FSM and start your troubleshooting with that manual. It's a lot, but its a good start.

Bon
 
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