Alright here it is I bought a 98 SH prelude in devember of 05 since then i've had problems with it misfiring every now and then I have changed the plugs, wires, cap, rotor, the o2 sensor before the cat and cleaned out the egr and I noticed last night that it is starting to do it again and I am running out of options. The only thing I have done on it is an intake, header, cat-back exhaust and pulleys I don't know if those could have anything to do with it but just figure I would add that in there just incase. Any Ideas????

 

Check your ground lines from your tranny and motor and make sure the contacts are clean. Are you throwing any CELs?

 

No CEL's yet I've only driven about 5 miles since I've noticed it I will check that out.

 

leave the engine on for a while to see if a CEL comes on....