P1516 SATURN -

Question

The SES light comes on but there is no other problems other than a slight rough idle when stopped or parked

Answer 1

P1516 Throttle actuator (TAC) module throttle actuator position performance

When you code this up,there is a difference between the calibrated amount ,and the actual throttle position,it will not cause a slight rough idle,but it can cause you to go into reduce power mode,If the vehicle is hesitating on acceleration P1516 may be caused by the rough idle. Check the ignition coil module sparkplug boot area for any indication of spark voltage seeking ground.