Sorry for late reply.
I'd have to make sure the battery has a full charge and battery connections all clean and tight. Then check your charging system. Some of the national brand auto stores will probably check this for free.
If you have the 4.3L engine, that fuel pressure spec on start-up is critical, 60--66 psi.
Your oil pressure spec says 18 psi @ 2000 rpms. Your oil pressure can go up and down with rpms.
Monday, March 16th, 2015 AT 2:18 PM