First off yes i searched and i cannot find a thread that has the same p0300 symptoms that i have. I have an 03 evo with a fp green, crower 272's and 680 injectors and a few other goodies. I have only had the car for a few weeks and since the dya i recieved the car i have had a random misfire that only occurs when i ever so slightly tap the gas at and idle. The car studders and then revs up totally fine. Keep in mind that this is only with the slightest of touch to the accelerator and it studders everytime. I have no boost leaks or vacume leaks.

anyone ever had this problem.

 

Try playing around with your fueling down low, it might be off and cause your car to misfire. have you checked your air/fuel ratio? might help

 

so the car was bought this way?....did the seller say who tuned or if this has been goin on for a while, or what they tried??

idk bro, maybe you should just take to a shop to retune....kinda hard with no prior knowledge of the car