# Carb Tuning **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [March 22, 2009, 1:28pm UTC](https://forums.speedlife.net/t/carb-tuning/64911 "2009-03-22T13:28:47Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![JEG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jeg/32/7246_2.png) [@JEG](https://forums.speedlife.net/u/JEG)\ **Post date:** [March 22, 2009, 1:28pm UTC](https://forums.speedlife.net/t/carb-tuning/64911/1 "2009-03-22T13:28:47Z")
My trans am has a stock rebuilt Rochester quadrajet 750 cfm 4bbl carb. It desperately needs a tune up but I have no clue about how to do anything with carbs. wondering if anybody here either has an extra carb for sale or could help me give it a tune up. I’d compensate for the time it takes and whatnot. ---
**Author:** ![JEG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jeg/32/7246_2.png) [@JEG](https://forums.speedlife.net/u/JEG)\ **Post date:** [March 23, 2009, 10:47am UTC](https://forums.speedlife.net/t/carb-tuning/64911/2 "2009-03-23T10:47:08Z")
anyone? ---
**Author:** ![Golden](https://avatars.discourse-cdn.com/v4/letter/g/e79b87/32.png) [@Golden](https://forums.speedlife.net/u/Golden)\ **Post date:** [March 23, 2009, 6:59pm UTC](https://forums.speedlife.net/t/carb-tuning/64911/3 "2009-03-23T18:59:31Z")
What year is the carb. and does it have the electric solenoid for the mixture on top or is it an older unit ---
**Author:** ![Jon](https://avatars.discourse-cdn.com/v4/letter/j/3bc359/32.png) [@Jon](https://forums.speedlife.net/u/Jon)\ **Post date:** [March 23, 2009, 9:24pm UTC](https://forums.speedlife.net/t/carb-tuning/64911/4 "2009-03-23T21:24:50Z")
Why does it desperately need a tune up? ---
**Author:** ![Bacon](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bacon/32/7230_2.png) [@Bacon](https://forums.speedlife.net/u/Bacon)\ **Post date:** [March 24, 2009, 10:39am UTC](https://forums.speedlife.net/t/carb-tuning/64911/5 "2009-03-24T10:39:58Z")
Quite a few details missing, how is purchasing another carb that isn’t setup for this car going to help? Does it need a rebuild? Lull in power? Tune way off? Failure to start? Specifics make the world go round. ---
**Author:** ![JEG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jeg/32/7246_2.png) [@JEG](https://forums.speedlife.net/u/JEG)\ **Post date:** [March 24, 2009, 12:18pm UTC](https://forums.speedlife.net/t/carb-tuning/64911/6 "2009-03-24T12:18:40Z")
Sorry…I don’t know jack shit about carbs lol. I just know its running rich, its like 6 years old, 750 cfm Rochester Quadrajet 4bbl mechanical choke. It tends to diesel when I shut it off after its been running for a bit. and it is KILLING me in gas. Normally a carbed 305 does a little better than like 12 mpg lol. ---
**Author:** ![Bacon](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bacon/32/7230_2.png) [@Bacon](https://forums.speedlife.net/u/Bacon)\ **Post date:** [March 25, 2009, 12:12pm UTC](https://forums.speedlife.net/t/carb-tuning/64911/7 "2009-03-25T12:12:24Z")
6 years old, lol. That’s not old. This link has some solutions: [http://www.answers.com/topic/dieseling](http://www.answers.com/topic/dieseling) Look at your plugs, figure out how your engine is running: [http://www.dansmc.com/Spark\_Plugs/Spark\_Plugs\_catalog.html](http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html) [http://www.theultralightplace.com/sparkplugs.htm](http://www.theultralightplace.com/sparkplugs.htm) How high is your idle speed? Any hesitation/driveability issues? What is your timing set to? It’s not like you can just sit around expecting people to fix stuff for you. It’s a simple thing, and if you plan on keeping the car something you should learn.