I have a 1999 prelude with 300k miles.... new plugs, wires, cap, rotor, air filter, thermostat and timing belt.... car runs perfect (motor is a bit tired, but perfect for 300k) other than at idle... when idling, very rough, sometimes dies and the check engine light flashes for misfire..... as soon as the rpm's climb it's all good..... there are codes for a misfire in 3 ( i think) i am thinking distributor but wanted some other input before i go there. Thank you in advance

 

I would start by checking your compression.