when im in my car when it first warms up it runs great. but after driving for a while, it feels like there is a big *** lag, like something is slowing it down... any ideas? little back round, its a 97 ek, with a 00 jdm type r. im still using stock radiator, and fuel pump...

 

Have you done any tuning yet? My car is like that right now. I am sure tuning will help alot.

 

Check your ignition timming.

 

change ur oil

 

possible electrical problems. ie. alternator/ ignition or timing problems.

 

Time for a tune-up.