Im having this problem with my 04 evo. After a highway drive, coming to a stop, the engine misses. Sometimes at around 80 mph it randomly misses for a second or so then throws a random missfire code. Once brought off idle it runs fine. Sometimes it stalls when taking off from a stop. It goes away when car is shut off for a short stop and then run fines.

Anybody have the same problems or any ideas?

I have replaced the plugs, wires, and coils from a known good evo and had no effect.

 

What mods are all done to the car? I would check the car for boost leaks by pressure testing the system. Check plug gaps, Do you have a dv valve or vent to atmosphere?

 

Plugs are new and gapped right. It only does it after a long drive. Mods are full exhaust. Filter and tune. I don't think it's boost leak because all thepower is still there and idles fine most of the time. Something is heatsinking and make it random missfire. Oh and stock bov.

 

What air filter?

 

Just a k and n filter to stock piping.