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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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| | | | Joined: Dec 2016 Posts: 5 New Guy | | New Guy Joined: Dec 2016 Posts: 5 | 41 1 1/2 ton dump truck. 216 w/rochester.While revving engine there is a stumble or cough before getting up to rpm.Carb seams to be in order,viewed all Mikes Carburator vids every thing checks out. Maybe I dont know how to tune it correctly. Points look good, coil tested ok,Vacum advance functions with vacum test,although sort of sticky,plugs look good. Certainly confused.Any help would be appreciated. Thanks | | | | | Joined: Jan 2010 Posts: 4,263 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 4,263 | I has a similar issue on a 235, adjusting valves and advancing the timing was the fixed it for me.
Just a couple of many things to check. But other will be along with more suggestions.
Shop manual a big help for initial timing
Good luck | | | | | Joined: Sep 2013 Posts: 1,367 'Bolter | | 'Bolter Joined: Sep 2013 Posts: 1,367 | Swap out the condensor. Been working with that subject recently and if you have one that’s less than perfect, a good one makes a big improvement.
RR
RonR
1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5
| | | | | Joined: Sep 2009 Posts: 296 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 296 | In my experience, when my 261 was coughing and backfiring, it was because the timing was set too lean.
-Patrick
1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red
| | | | | Joined: Feb 2001 Posts: 1,094 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,094 | If the vacum advance is sort of sticky I would clean that and make it not sortof sticky and see what happens.
Tommy
59 apache 1/2t
261 short stepside
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