Truck will not start on the first try you have to crank 2-3 times before it turns over, we have changed fuel regulator, fuel pump, ignition module, coil pack, truck runs great once started never dies, sometimes it can sit for 5 minutes and have trouble starting or times it just starts right up and sometimes it can sit all night and still start right up. it has trouble starting cold or hot it don't matter
Install pressure gauge and watch when key is turned off to see if pressure drops to zero if so bad drain back valve in fuel pump replace it or deal with it or could be cheap aftermarket pump and has hard time building unnecessary pressure to open poppet valves between before fuel injectors
SOURCE: 2000 GMC Jimmy will not start
The oil presure switch does have some bearing on the problem but my suggestion is to change the coil. I had a the same problem with an astro van. I changed everything that you have described and it fixed the problem just for a little while and then all of a sudden did it again. I changed the coild and the cold start swithch and never had the problem again.
SOURCE: 1995 GMC Pickup Won't Start After Sitting Over Night
93 GMC PICKUP WONT START REPLACE RELAY SWITCH'FUEL PUMP' MODULE CONTROL BOX' POUR GAS IN TROTTLE BODY TRY TO RUN
SOURCE: 96 gmc sierra hard to crank after 12-14 hours
that has a votec engine in it the fuel pressure is droping at knight and it takes 60 psi before the injectors will fire most likely cause fuel pump ,leaking injector ,or a feul pressure regulator
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