I have a 2000 chevrolet impala done had 3 sensors put on it still want stay started crank it up and it cuts right off

you found the right place buddy.. i know a lot of websites for repairs and manuals that can really help u..
like reliable-store is amazing

crank sensor located behind the harmonic balancer is most likley the problem those motors are known for that.

your anti theft device is activated,you need to lock and unlock your doors a couple times with the key fob,not the key,and then you need to put the key in the ignition and start it,if you dont have your key fob,call your car dealer to get a new one,they are programmed for each car only,you cannot bypass it.

two common causes of this problem are:

1. leak in a vacuum house
2. bad throttle position sensor.

you should have volts with key on at the pump but it only will show 12 volts for a few seconds as the relay will only stay energized when cranking so if you have 12 volts and fuel pump still does not run check the ground if the pump is good and you have a ground and you have 12 volts pump should work make sure the connector on the sending unit is not corroded or burnt

Bad injector(s)

is check engine light on if yes wht is the code

Inspect, clean or replace the Idle Air control valve...about $35 for the part...also how is the air filter? A clogged catalytic converter can cause this too? ( A free check at quality muffler shops. Hope this helps.

It May have NOT had Enough Time to SET a CODE, The Next Place to Look id the Crankshaft Sensor, Some Can Be Tested @ AutoZone for FREE so as NOT to Waise Money, Also Tap on the MASS Air Flow Sensor and see if this Lets it Start Of So you Found the Problem. Under these Conditions it is Dificult to Determine the Problem, But These Items I Have Here Are Definate Places to Look and ARE INDICITIVE of Failing in this Modle.

Need trodle position sensor replace.