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No highway power
1990 Nissan 300ZX

No highway power

(1990 Nissan 300ZX)
The car runs well from 0-60 but just stops at 70mph. I have tried everything i could think of and still no power.(sensors,injectors,vacuum,ignition) I must haved missed something.. Please help me
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Popular Answer
If the car losses power at 70 miles an hour I would check fuel volume and pressure.Tee in a fuel pressure gauge and tape the fuel pressure gauge to the windscreen and drive the car noting the fuel pressure when the car looses power. Check the fuel pressure volume it should be a pint in ten seconds. A restiction in the exhaust could do the same thing.
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Vacuum Leak Diagnosis
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If the car losses power at 70 miles an hour I would check fuel volume and pressure.Tee in a fuel pressure gauge and tape the fuel pressure gauge to the windscreen and drive the car noting the fuel pressure when the car looses power. Check the fuel pressure volume it should be a pint in ten seconds. A restiction in the exhaust could do the same thing.
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If you have a cold air intake, the cone air filter can mess with the way the air flows over the mass airflow sensor at high speeds. To rid this problem ive heard to place a couple pieces of duct tape across the cone filter on the bottom to make the air flow differently into the intake.
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