Carter Carb Issue

My jeep Idles a little fast so I tried to slow it down...

Now it starts fine and idles a little slower but If I breifly hit the throttle its revs up, then revs back down and stalls.

 

Idle mixture too lean? Vacuum leaks? Idle speed set too low? I presume you used the curb idle screw on the linkage to adjust the idle speed.

 

yes I used the curb idle screw.

It idles fine when I start it, it will just keep running, even a little too fast. it only stalls when I step on gas then let off

Right now I have it running very lean. Could that be the issue?

 

I have the Carter Carb on my 258 and I went HERE and followed the write up on how to tune/fix the Carter Carb. I did NOT believe it would work, but sure enough it did!

Worked so good that I am STILL using it after my 4.0 Head conversion (258 intake and Carter Carb)!

I was going to get the Weber Carb or a rebuilt one from that guy on eBay that makes all those "special carbs" for the CJ's, but mine runs too good now!!!

Runs like new. Again, I did not believe it would make that much of a difference, but it did! Try it, costs nothing and an amateur like me could do it!

Just my 2 cents.

~Boodie

Here's the "How To" write up again: http://jeep.off-road.com/jeep/article/articleDetail.jsp?id=277064

 

Like boodie said in the above post it may help. I did it and it solved my problem completely. I was at my wits end on what to do. It sure runs fine now, it is so simple a caveman can do it !!

 

Pokeman listed his motor as a 232, unless it has been changed, it will be the YF 1 barrel, a totally different carb than the 2 barrel BBD. My 75 258 also has the 1bbl YF, so I know they didn't make the switch to the infamous BBD until at least 1976.

Pokeman, I too am trying to save as much fuel as possible, messin with the carb tuning to the extent I know how. Yes, running too lean could cause your problem. Richen it up a little and see what you get. It might be time for a rebuild, kits are pretty cheap.
Make sure you don't have a vacuum leak somewhere. When I first got the jeep, the carb was bolted to the manifold finger tight. Correcting that and other vacuum leaks really helped.

 

If you are running a YF I think the idle Circuit may still be the culprit, I agree with Boodie , timger and farfle on that issue.
For what its worth I have worked on a few earlier YFs ( 938 SD Models ) that had intermittent stumbling just off idle and poor low speed performance, while they seemed to idle ok the mixture screw seemed overly sensitive and a steady curb idle was hard to achieve.
While there could be some crud or fuel tank rust particles partially plugging the idle/low speed jet tube orfice, When you have it apart take a good look at the very bottom of the idle/low speed jet tube where its swagged down. I have ran across two carbs that had the idle/low speed jet crimped partially shut with side cutters in a misguided attempt to lean the fuel mixture and save fuel. While you can effectively change idle/low speed jet size to improve low speed economy in many cases crimping with side cutters certainly is not the right way as it only takes a .001 change in diameter on an orfice that small to alter fuel flow to the off idle port by 7% or more.
This may not be your problem but its worth eliminating while you have it apart for cleaning and inspection.
One other thought, Is the throttle shaft excessively loose in the carb body making it difficult to adjust the idle mixture. It would be a source of vacuum leak like timger mentioned.