Accelerate

When I accelerate it is not fluid but feels like your turning up a dial notch by notch. Rather then going from idle to 5 to 6 k rmps, it will accelerate to 2500 rpm then pause for like .5 seconds then go to 3000 and so on. Once i reach 5000 k plus rmps it stops doing that. If i do a fast start it wont do that. But if i'm around 3 or 4 k rmps and then floor it there will be a delay and then it will catch up and accelerate normaly. Some times my car hicups alittle. Please help

I have a:
97 civic 4d
aem cold air inkate
dc 4-1 headers
Alt and power steering pulles
and free flow cat converter and greddy catback.
I also had to custom legnthen the second o2 sensor and i used proper gauge wiring and solder them togather and used those plastic wire coverings