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Need Help. I have an 85 300Z non turbo. It will start and run for a while and then tac. will jump and the motor just dies. Some times will run for 20 or 30 minutes,sometimes less than 5 minutes. Have replaced fuel filter and checked fuel pump. Have tried reading codes on computer box butget mixed codes. Can anyone help me.
Have had the car for about 6 months and is won one the finest cars I've ever driven.
 

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first check if its fuel or spark. I had a similar problem at it was the fuel pressure regulator. Could be the distributor going bad or the crank angle sensor inside if its spark related?
 

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If it's runs then starts to stumble or cut off-especially after you have trouble "mixed code issues" that is probably the issue or even the AFM. i changed mine because it was doing almost the same thing.
 
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