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Check for a vacuum leak. Check all the vacuum hoses first, then check around the carburetor. Check to make sure the carburetor is bolted down tight.

When the engine idles, it can suck in a little more air, and still run. Most of the time it will idle faster than normal if there is a vacuum leak, too.

When you put the engine in gear, it needs a more precise fuel/air ratio.

Hope this helps !!

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Q: 77 351w that will idle in park but not in drive or reverse?
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