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Originally Posted by rwhite65
I have broken just about everything you can with transmissions in the last ten years and I have had T.C.'s fail before. The original problem may have to do with the lock up, but my gut is telling me we were on to something with the carb. My knowledge of carbs has always been inferior, until recently when I decided I would learn all I could. PKRWUD, your knowledge of the carbs is incredible, so bear with me on this. Holley advises to use the vacuum gauge to figure out the proper power valve, as they also felt that was my problem when I called the tech line. I have not looked to see which power valve I have at the moment, but I am betting it is the 6.5, more then I need according to Holley. Plus, the new Holey book I bought talks about how the power valve can be responsible for surging under loads. You helped me get rid of the off idle stumble, and the only stumble (I called it a shudder) left is under a load, with my AOD. Makes sense to me that I am on to something there. I may rig the Vacuum gauge up in the car to confirm this.
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I think the problem I'm having is in the terminology you're using. A stumble can be caused by a carb issue, a shudder tends to be caused by slippage in the driveline (for example, a burned flywheel will cause a shudder when you let out the clutch). It's all good, I just wasn't clear on what you meant.
Regardless, I agree that your first priority needs to be identifying your new problem. Just out of curiosity, do you have a vacuum advance on your Unilite?