Question about Pontiac Trans

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1980 trans am 5.0. won't keep an idle. what should i do. where is the idle adjustment?

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  • Pontiac Master
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The idle adjustment is located at the throttle plates, but consider having a mechanic look at it, as you may need mixture adjustment, or have vac leaks....

Posted on Sep 05, 2010

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Posted on Jan 02, 2017

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This web site won't be of any use to you

This is a social forum, we are at home the same as you
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Hello I have a 1980 Ford Bronco 351 2bbl. Wondering if anyone knows which screws adjust what? Please if anyone has any ideas please respond. Thank you.


Here are some images that might help to assist you, and let me know if you require any further assistance.


Adjust the curb idle with the engine warmed up and the choke off.

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The air/fuel mixture screws should be adjusted with the engine warmed up and at normal idle speed, then turn each air/fuel mixture screw in one at a time until the engine just begins to mis-fire, then back the air/fuel mixture screw out 1-1/2 to 2 turns out a half a turn at a time until the engine idle is the smoothest. (your vehicle might have restrictor caps over the air/fuel mixture screws to limit the amount of adjustment)

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The choke adjustments;

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To adjust the vacuum tension pull on the choke pull-off:

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Adjust the fast idle screw to the proper RPM with the engine cold and the choke on.

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1980 Trans am original 4.9 engine. I messed up fuel and air screw


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Did you adjust the shift rods from the shifter to the trans shift arms. Take your shift rods loose and put shifter in neutral, and transmission arms in neutral, then adjust the rods so they slide in. Then your shifter matches your transmission and you should be able to shift just fine.

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