Hi i have a 1991 300zx twin turbo runs well always have been well kept.Two weeks ago i had a problem with the car shutting off on me if i drive it more than 25 minutes then it wont start for about 10 mins it then will start up and run fine then shuts off again if i continue to try and drive it. Fuel is fine, changed ptu, cas, new ignition switch. If i leave it and let it sit for a while it will run and wont shut off unless under load(while being driven). No error codes from car ecu nor when it was put on the computer but cylinder 3 is weak and 5 no fire but the car runs very well with no loss of power. I know my z history I have owned this car for over 5 years and i have been in the nissan family from i got my license but cant figure this one out please help
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