when i originally built my motor it threw the ckp and cmp code. this was due to the fact that i didnt fully tighten the distributor hold down bolt. after tightening this i decided to change the crank sensor anyways and bought one from my local napa knowing about their problems with the sensors. today i replaced the crank sensor and it still skips around 2500 rpm's. could it do this being out of time? I would think that it would throw a miss fire code before this code and i recently tightened the distributor hold down bolt but didnt check the timing. could this cause the skipping around 2500 rpm's? has anyone else had this problem?

 

Not saying it will fix your issue, but you need to have the fuel sync reset. Which is done with a capable scanner.