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Click on image for the lowdown. 
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| | | Forums66 Topics128,037 Posts1,055,466 Members48,424 | | Most Online14,466 Apr 26th, 2026 | | AD Chevy Trucks Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | That oil pressure is low for a GMC but that wouldn't affect the running.
Sounds like a carb rebuild is in order.
If you have an adjustable main jet you could remove it and check for trash in the opening. Before you take it apart screw it all the way in and count the number of turns so you'll know where to set it going back. | | |
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