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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,065 Posts1,055,870 Members48,428 | | 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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | Sounds like a vacuum leak. If you get the truck warmed up and idling take a propane torch and turn the gas on low. Go along the intake to head areas, carb base gasket, if you have a leak it will suck the propane into the engine and it will speed up. | | |
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