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Kevin

I thought of the potential for a vacuum leak when I was running through the problem last week. I checked the throttle shaft during that investigation. Actually, the throttle shaft on the base section that I removed was slightly tighter than the replacement. This is why I believe there was some defect or damage internally, within the original carb base section (letter C). Either that or, the carb base that is lettered with a C, is not intended for the 235 with manual trans.

I have a good carb vacuum balancer, and the throats were perfectly balanced when this problem began. I checked them again during my troubleshooting and they were still balanced. My suspicion is that some passageway was either blocked or, was open when not needed for this application. As I do not know what the differences are between the base that is lettered with an A, versus the base that is lettered with a C, I can't be sure that they are interchangeable, or of the same design.

I plan to do some research on this issue today, if time allows. I'll report back on what I find.

Tom