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Q: 300zx on 1990 Nissan 300ZX

I have a 1990 Nissan 300zx N/A which hasa proble when i start up in the morn ing the car runs good but after running for abot 10 to 20 minutes the car loses power what could be the problem?
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How many miles are on your car? I have seen the catalytic converter get restricted, I have seen air flow meter failure, and fuel delivery/ volume problems, but everything is a guess without actually having the car to run tests on. This car has diagnostic capabilities. A computer that has control over the ignition and fuel injection is located in the passenger foot well area and has several modes of diagnostics.
Does the car just gradually loose power as you accelerate, or chug and sputter as you try to accelerate?
I'm having the same problem with mine. It's doing all that you're saying. I need help
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