I have a 1993 sc400 with 156xxx miles, took it in today for control arm bushings and it was running fine. got halfway home and at the red light the idle dropped to right above zero, and it seemed to have lost a lot of power. Was just wondering what this could be.(i searched)btw

 

i checked spark plugs, and the MAF. dont know what else it would be.

 

anything will help. cause i have no idea