sounds like it could be a timing or timing advance problem.
have your changed your timing from its stock setting?
also check to see that it is stock or whereever the cam or other parts specify. i had the problem on my car with my timing was too advanced. it would hesitate for a second before it would take off and had small backfires while trying to start the car after it was warm.. tapped the timing down a little and the car starts perfectly every time and the hesitation is totally gone. what a big difference that made.
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66 mustang-292-Holley 4160-World Castings Windsor Sr.-Hooker super comp headers-MSD box & Coil.3.55 gears. B&M Z-Gate-Black leather racing seats with 4pt harnes.
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