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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Mar 2014 Posts: 4,479 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,479 | Could also be a badly worn cam gear/cam gear retaining plate. This happened to me about 35 years ago. It will cause the cam (at idle only) to wander in and out. Sounds odd, I know, but it will happen and when it does it changes your timing enough to make the engine miss and idle roughly. This disappears at rpm higher than about 7 or 800. The frustrating thing is there is no easy way to fix this and you can check about 10 things before you finally find it. Good luck.
Jon
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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