3.5% works well on SCs. the lamda system is still on the car isn't it? regardless if the oxy sensor is unplugged, the system that works the frequency valve MUST function or the car will be a dog. the computer that works the valve is under the passenger seat. there is a small relay next to it that turns it on. it may be dead. with the engine hot, unplug the relay. if the engine immediately runs differently, then the system works. if not, check power to the relay which comes thru the domelight fuse, or replace the relay. then reset the mixture because it will be way off if it was set with the system inoperative.
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