THE MOST COMMON CAUSE OF THIS KIND OF SEVERE HESITATION IS THE MASS AIRFLOW SENSOR (MAF), IT WILL NOT SET A CODE IN MOST CASES. SEE PHOTO OF TYPICAL SENSOR
I'd start with a computer diagnostic first which can be done free at AutoZone usually or for a price at other car part stores.
If you don't get any error codes, then my next step would be to
verify the fuel pressure is within spec using a fuel pressure gauge. There could be a leak somewhere in the fuel lines. It could also be an
electrical short in the engine harness or possibly a bad ignition module
since they trigger the injection in many cars and can have an
intermittent problem.
If that all checks out, next verify that the air flow meter is working correctly.
This is a good start, let me know what you find when you check all of the above options. Changing the fuel pump and the filter was a good start and would have been the likely problem in most cases. Very strange though.
Benjamin
What the dealer said, I assume they base it on probably testing the car while you had it there. What they said is what I would have checked next and so if they said that distributor and a sensor is bad, then they probably are. Did you get any error codes when having that done? The sensor should have come up.
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SOURCE: My Nissan 200sx when I step on the gas it cuts out
The the airflow meter can shut off the car completely, it can also stop the car from reving over 2000rpm "limp mode" to save the engine from getting un-measured amounts of fuel.
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I already did all the steps you told me but still there is not change.Yesterday I took to nissan dealer they told me I need to replace distributor and cmp sensor.Do you think this will be a solution to my Nissan Xterra 2001.
Thanks
Before I went to the nissan dealers ,I went to the other garage I usually go.He scaned but he couldn't able to find out the problem.THe scanner didn't show any error but the nissan dealer said it showed the error.but I wasn't there when they were testing.MY question is from your experience do you think that can be the problem according my discription.
Thanks
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