When I installed my 383 with a bigger cam in my 89 Vette, I had the same problem..You could feel the cam surging at certain lower rpms in high gear with the convertor locked up , mine was always at 1100- 1150 rpms...I reburned my chip to set my high speed convertor lockup at 53 mph and unlock at 49 mph and the symptom went away... I'm also running a stock torque convertor, if my convertor had a higher stall speed like 2200-2400 I may not of had the problem in the first place.....WW.
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