SUS55

I have a weird problem in my RB silvia and am really stuck for ideas for what it could be!! When the car is cold, and only running for about 5 minutes, it pulls hard and has NO problems whatsoever... But after 5-10 minutes when shes nice and warm, she starts coughing when coming onto boost and backfiring and yeah, not a happy engine... My thoughts are its an ignition problem? spark plugs/coilpacks etc? so i replaced my plugs with new iridiums, gapped them and shes still doing it... So my next guess is coilpacks, they are 2nd hand coilpacks that are in there at the moment because they had to be replaced as the last ones ummm, melted. I NEED HELP, ANY RB EXPERTS?

I have an a weird problem in my RB silvia and am really stuck for ideas for what it could be!! When the car is cold, and only running for about 5 minutes, it pulls hard and has NO problems whatsoever... But after 5-10 minutes when shes nice and warm, she starts coughing when coming onto boost and backfiring and yeah, not a happy engine... My thoughts are its an ignition problem? spark plugs/coilpacks etc? so i replaced my plugs with new iridiums, gapped them and shes still doing it... So my next guess is coilpacks, they are 2nd hand coilpacks that are in there at the moment because they had to be replaced as the last ones ummm, melted. I NEED HELP, ANY RB EXPERTS?