If this vehicle has high miles, the camshaft timing gear nylon teeth may be breaking off and going into the lower part of the oil pan, blocking off the oil pickup tube screen. Oil starvation.
SOURCE: I have a 1991 GMC C1500 5.7L 350. oil pressure switch
You might try a sending unit socket, or try to break off the upper plastic part of the sensor, to try to get a socket on it. I've had luck with a pair of Channel Lock pliers.
Testimonial: "good advice thanks"
SOURCE: My 1991 GMC with a 350 V8 is hard to start. Runs ok once started.
check fuel pump for proper pressure....Also very common is a bad o2 sensor not allowing enough fuel.
SOURCE: 1990 GMC Sierra lifters knocking. Oil pressure
I doubt it....It could be a totally worn out engine.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
SOURCE: I have a 1998 GMC
If it has a bunch of miles on witch I'm guessing it probably does you can try to adjust your rocker arms. This seems to more of an art then I science for me, I always have to have someone help me. See *** the cam, push rods, & lifters ware the rocker arms loosen up some. It was explained to me that you just want them tight enough you can still see them rattling around has to be done with engine running and valve covers off. Make sure you have at least a couple quarts of oil laying around.
here is a video on how to do hydraulic lifters http://www.youtube.com/watch?v=HSR36fmBR6M
here is a video on roller rockers http://www.youtube.com/watch?v=ktvIQgGhz18
More instruction can be found online or maybe you have a friend that is experienced in adjusting them.
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