My 2000 Nissan quest all of a sudden slowed way down and the rpms started bouncing while applying the gas at 2000 rpms but idled fine. I turned it off... It wouldn't start back up... Any ideas ?

SOURCE: 2000 nissan quest

There is a sensor in the distributor that tends to cause this problem. The sensor is the called the camshaft position sensor and it is responsible for the ignition timing. If you have a timing light you can verify that the sensor is faulty by checking the timing while the engine is acting up. If the sensor is faulty, the timing will be erratic or just plain wrong. In many cases cleaning the sensor will correct the problem.

To clean the camshaft position sensor: Remove the distributor cap and rotor. This will give access to a metal plate that covers the sensor. Remove the screws the secure the plate and remove the plate. Inside there should be an optical sensor that you can clean using a spray type "Sensor Safe Air-Intake Cleaner". Eye protection is recommended when doing this.

Unfortunately, cleaning the sensor does not always fix the problem. In that case, the fix is to replace the distributor. Since the distributor is quite expensive and the problem could be something else, it is recommended that you use a timing light to check the ignition timing for any problems to confirm that the problem is the camshaft position sensor.

SOURCE: 2000 nissan quest, service engine light on, idles rough...

sounds like it , the sensor should be on the exhaust somewhere,whith wires on it

SOURCE: 2002 nissan altima p0507 idle problem

I had the same problem before. after using the scanner i got a code number P0507. "Idle Air Control", New 2002 and up Nissan models like my Altima don't have an idle valve or sensor like older models to be replace. Here's the solution " Replace your "Throttle Chamber" the idle sensor is build in it, there is no other way to fix this problem. the throttle chamber is about $175.00 at your Nissan Dealer. The need your core or you will need to pay extra money. No need for expensive mechanic shop, you could do this your self. the throttle chamber is so easy to remove, four screws holds it together. I will take you about ten to twenty minutes to replace it. Please trust me and you will save big bucks!!!!!

SOURCE: 2000 nissan xterra hesitating when engine is warm

We are having the same problem. We are right now changing the crankshaft position sensor along with the intake and manifold gaskets.

SOURCE: 2004 Nissan Quest began shaking while driving then

SOUND LIKE FUEL PUMP.SCAN IT TO MAKE SURE.IT ALSO COULD BE FUEL PUMP RELAY OR FUSE.