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Are you missing anything else? Engine cranking, do you have spark at the plugs? Also, use a gage and check proper fuel pressure, engine cranking. Any applicable trouble codes? If your missing spark--fuel pressure and fuel injector pulse, I'd have to check for rpm signal, usually, comes from crank sensor.
Key on, did you check for voltage on pink wire at fuel injector, use a test light to check for voltage. The computer grounds the fuel injector if rpm signal is present.
I don't know what testing you have done?
Did you test for spark? I would check spark and fuel pressure. OK, here's a little bit of working theory that'll help you to see the ‘why’ of the Noid light test.
Whether you're testing a No Start Condition or a Misfire Condition, you'll need to know if the cause of the problem is a lack of fuel. When your GM 3.8L (Buick, Chevrolet, Oldsmobile, Pontiac) does not start, it will be either because of a lack of fuel or spark. The same thing goes for when your GM 3.8L equipped car or mini-van is misfiring... that specific engine cylinder isn't contributing to engine power because it either lacks fuel or spark.
Now, since the above two conditions (No Start and Misfire) can be caused by any number of things... one of the things that has to be eliminated, from this list of possibles, is the fuel injector not getting power or the injector pulse signal (On/Off switching signal) from the vehicle's Computer.
This is where the fuel injector Noid light test comes in handy, because you're able to visually see if both of these signals are present or not. If no flashes, then now you know that you have to verify that the connector is getting power (12 Volts) and the injector pulse signal.
One thing to keep in mind, is that the fuel injector Noid light test does not test for a BAD fuel injector. But, is the first step in verifying if the fuel injector is BAD or not. For the fuel injector test tutorial.
Have you done any testing? Any applicable trouble codes? How long since a tune-up?
When the vehicle stalls do some testing, if the engine is hot, wear gloves. Use a spark tester, check for spark with engine cranking. If spark everywhere, at least you know that system is ok.
If you lose rpm signal, during cranking, no spark, no fuel injector pulse. I have seen crank sensors that would do that, the rpm signal comes from crank sensor. Your not giving us enough info to determine if it is the crank sensor?
random misfire can be due to bad sparkplug wires or a vacuum leak at the intake, there are many thing that can cause a random misfire even low fuel pressure, and last would be dirty injectors. i would start by having the fuel pressure checked and then having the injectors cleaned.
I think I may be able to help you, but first we need to clear a few things up. Is it getting spark or not? If it is getting spark, why are we testing the ignition module? The next question would then be how did you go about determining that it is getting fuel? Have you tested your fuel pressure? If so, what was the pressure reading? Did you check for injector pulse to make sure that the Powertrain Control Module (PCM) is able to fire the fuel injectors?
Also, you are working with an engine where the ignition timing and the fuel is controlled by the PCM. Have you scanned the PCM for fault codes? If so, what codes did you get?
If you do not know the answers to these questions, or if you do not know how to do this stuff, post a comment to let me know. I can give you step by step instructions on how figure this out. These questions MUST be answered before anybody can give you any REAL help with your problem (Although many may try to "guess" - which rarely works and usually turns out to be VERY EXPENSIVE!).
Thee are a couple of things left to check. One is to hook up a fuel pressure gauge to the fuel rail and see how much pressure your getting and compare it to specs. It maybe getting fuel there but not enough pressure. To see if the injectors are being pulsed you wil need a set of noid lights. You will unplug an injector and plug in the noid light. It will flash everytime that injector is pulsed. If it never flashes your injector drivers on the ecu are bad.
You need to use a LED type test light for the injectors or a Bosch style Noid light for the injector. To test the cam/crank sensor signal you either need a scanner to read them or a lab scope to show you a signal. The pickup plate in the dist handles the injector timing, the crank sensor provides a RPM signal. They both feed the computer information for ignition timing. Good fuel pressure, injector activity(Noid), and good spark out of the coil. The coil is what I replace the most of.