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Hey all, i am from australia. I have recently put a 1jzgte in my mark 4 supra. But having problems with it. It is coughing and splutering under load. Cruised around alright until i put the foot down a bit. I have changed the map sensor, ignitor pack, tested all the coils and had it at a dyno for a couple of hours. Any help would be great. Also the mods so far are 3" exhaust with custom dump pipe, fmic and pd, thats all. Thanks Rohan
 

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do you have a boost guage on it? with an exhaust like that it might just be hitting boost cut?
 
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