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i am unsure on why the car is sputtering although at idle it may be stalling out/dying due to the IAC(idle air controll) first try to clean the iac it is located next to the throttle body if that does not work you may have to buy a new one wich range at about $300 (unfortunatly) try the TPS , am pretty sure tha's the problemo.

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15y ago
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Q: What could cause a 91 3000gt sl to at speeds 50 or below sputter and buck while trying to maintain steady speed and at idle for a long while die unless gas is applied and fuel pump has been replaced?
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