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Hello I just bought a 1976 280z, My first z but i have done a lot of research on them. It will start up easily and run cold well at around 800rpm. But once it warms up (the temp gauge is about in the middle.) It will drop down to 500rpm and stutter. If I give it barley any throttle to bring it to 800 rpm it is fine but if I go up to 1000-1200rpm it will back fire through the intake and exhaust. The plugs are back but not fouled. If I manually control the AFM it will run fine. I also unplugged the connector to the cold start injector but it did not seem to change anything. I am thinking the temperature sensor is the problem. also there might be some vacuum issues because of any dry rot (I plan to re-do all of the vacuum lines). I do not a lot about how the efi works on these cars except for the basics, and I would like to know how everything works. -Thank you
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