superchargeboy

hey ive got a ae92 1992 model with the supercharged 4age...lately the eng light has come on and it just wont rev/drive properly..ive had mechanics look at it and they can't find codes but one today said it feels like its in limp mode? if anyone has come across this before let me know...or what can i look at myself? i was told the sensor inside the air box had been permanently disconnected? is that bad?