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So what is the idle speed? Or you really don't know? If you dont know that and it's not important, change the convertor. You're beign told waht the issue more than likely is. The fact that you havent been able to do it yourself means nothing. I get fresh hands on things I get stuck on too. But the symptoms are the idle is too high, the mix it too lean, or the timing is too retarded for it to make any power at idle. It's lurching because your idle speed is too high for a stock convertor. Not the cam or engine is too radical. There is no reason if that engine is healthy (but stock) and using that cam that it shouldnt be purring along idling at 700 or lower. The stock stall is like 1200. So if it's idling at 900, or 1000, it WILL lurch. Fix the problem. Not the problems it's creating.

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