88 GMC 1500 troubles

Hey, I was hoping that someone could help me out on this one. I have
an 88 GMC 1500 with 166k. I bought it a few months ago. A few weeks
after I bought it  I was driving and everytime I would hit the brakes
or let the engine idle, the check guages light would come on due to
the oil pressure dropping off to Zero. I figured maybe it was a bad
connection at first. I gave the engine an oil change and the problem
seemed to go away for a bit. Then after a few weeks, same problem
again. Only when I idle or hit the brakes taking power away from the
engine. As soon as I hit the gas, the oil Pressure comes back up
again. It used to run at about 100 Kpa. Now it seems that the oil
pressure is running a lot lower, and when I take my foot off the gas,
the oil pressure drops to zero. When I hit the gas again, sometimes it
doesn’t even come up. Does this sound like a bad pump, guage, faulty
wiring, or Worse? I don’t know these engines very well, so I am asking
for help. It seems also when I’m running it for a while and the oil
pressure is up again the check engine light will come on for about
20secs. then extinguish, this has only happened over the last couple
days. Anyone know how to get the codes of this thing. Any help would
be appreciated. Thanks

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aarcuda69062 (02.09.2008 15:20)