Posted by JimB2 on April 05, 2009 at 08:56:14 from (99.240.236.11):
In Reply to: 454 help needed posted by ljw on April 05, 2009 at 08:22:38:
Hi, my first disclaimer, I have never worked on gas model of 454 only Diesel model but the usual cause of the stumbling when throttle is advanced rapidly is to lean of gas/air mixture. One of the causes was vacuum leaks and since you have replaced the manifold gasket it s probably not a vacuum leak. Another was the low speed/idle jet being adjusted to lean. I looked at caseih.com parts for C-152 gas engine carb and did see an idle adjust screw for carb, so try openning idle adjust screw an 1/8 of a turn at a time and see if this helps any.
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