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Discussion Starter #1
ive got an r33 gtst ive done some basic mods like fmc full exhaust system on induction dump valve fast road clutch but for 1 thecar does not idle properly and 2 on heavy load as i floor it it starts to misfire but if i dont floor it its ok. i thought it was the plug so i put some ngk iridium grade 6 plugs in, which slightly made it better but its still there, any suggestions any1 need help
 
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