I think you have it spot on with the crankshaft sensor. Before I went and bought another sensor, because they are expensive, try cleaning the old one first. I have a Blazer and that is what I did, but my sensor was bad so I bought another one and everything works now.
SOURCE: 1999 chevy blazer fuel problem
probably not fuel filter . probably going to have to remove the upper intake and replace the fuel injector spider(fuel inj assebly) if it is droping fuel pressure it is leaking into the upper manifold
SOURCE: 1996 chevy k1500 w/350 eng.fuel system
Try replacing the intank plug-in for the fuel pump. They have been known to go bad even though they look okay.
SOURCE: 00 Cavalier won't stay running.
need to have it scanned to see what codes it has but sounds like a security system problem factory or add on if key has chip in it security prob very likely.hope i helped
SOURCE: 2004 cavalier 2.2L DOHC.
I hate to say it but you need to find out if the ECM is communicating with any other modules.You should see if you can find a independent service place that has a tech 2. A scan tool that is not a tech 2 may be helpful but a tech 2 would help you pin point things quicker
SOURCE: Check engine light with Fuel Pressure Reg.code on 2004 Duramax
They have the same problems. What code are you getting? I may be able to point you in a better direction.
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