I tried everything except a new clutch and have injectors cleaned, well almost. As far as the clutch I'm guessing it's not the 9 bolt cat style but how do I tell? and how much are the parts and a good clutch kit going to cost when upgrading to the 9 bolt. Thing runs great if you do not punch it it but seems to load up at idle. Is this just they way this year and motor run? Anyone have one with no bogging issues? Would like to fix this issue if possible. Any help appreciated. This is an EFI 580 motor.