When car is cold it runs good, when warms up its seems to hesitate stutter for a while then go...any ideas for sure not transmission because it was just rebuilt

 

I do not know what year or what car you are even talking about.... please use the signature feature to help people known what vehicle you are referancing so we can help.

But this question, as it is general in nature, should be posted in a generation spacific forum like "LT1 Tech or LS1 Tech". Since i dont know what car it is i cant move this to the correct forum. Please repost you question in the correct forum for you year vehicle. Thank you.