Ok so 92 sc 400, car has very little power in drive, almost as if its in 4th. When overdrive engage, it flashes. Intermittent CEL, throwing code 13, but I dont think thats related. Car drives normally in L and 2.

 

Might be shift solenoids.

 

Thank you. Would a malfunctioning shift solenoid throw a CEL?

 

Sometimes. But, the sign for shift solenoid not working properly is O/D keeps on flashing or light stay on even if it was turned on.