Have you adjusted the set screw inside the hex-head end of the solenoid to adjust the base idle? After turning the solenoid to adjust the idle speed, turn the 1/8" hex screw inside all the way on the solenoid, unplug the solenoid, and then adjust the hex screw to get the base idle speed you need (425rpm on my '78 manual). To adjust the hex screw, make sure you have a wrench on the solenoid so you aren't turning the whole unit, just the screw with a Phillips head. Plug the solenoid in and recheck your idle. This usually helps the engine pop-off when you turn the key.
ah ow. I didn't know there was a screw in there. I don't recall seeing anything on the end of mine for except a electrical plug. Maybe a rubber cover, but then again, I could be wrong. Still getting to know the car.
I was just turning the whole solenoid. Ugh!!
I unplugged mine to test it. I have voltage to it, but it doesn't work. I will try and do what you just said though. I had no idea there was a screw inside that solenoid.
