Question about 1987 Nissan 300ZX

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Engine will cut out and hesistate or stumble when around 2500 to 3500 to the point of of lose of speed whyll driving does anybody know whats wrong

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Replace air mass. sensor (air filter side) . check exhaust catalatic if close

Posted on Jun 22, 2011

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Posted on Jan 02, 2017

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Loss of power at highway speed is usually clogged fuel filter or clogged air filter. Checking fuel pressure won't tell you if the filter is clogging up. You can still have pressure, just no volume. Air filters can do the same, except it will usually die or stumble coming to stops. The abs and disable light won't affect the engine performance. Hopefully you have a bad wheel sensor that is also disabling the AWD. The sensor is around $100 the actuator for the AWD is over $300

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More common for shifting stumble to occur from Park to Drive, engaging a load on the engine, not to stumble to a freewheeling Park position. Sounds like idle speed control is sluggish to stabilize the motor.

You also have idle speed control problem with A/C, kind of shows that A/C was what kept the engine running because when you turned the A/C off, the car died.

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It seems that the base Idle speed control is not working and the A/C idle speed control is.

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