Cadillac Repair: car missing on startup, throttle linkage, throttle switch

Question
my 1985 deville started missing very bad on startup but as u drive it
smooths out. so i idled the car up a little so it wont cut off when i first
start driving. i cheked the codes and got code E27. what does that
mean?

Answer
E27 = Open throttle switch of which was set because you throttled up the engine as the nose switch on the IDLE SPEED CONTROL MOTOR that keeps the engine idling did not detect the throttle linkage touching the nose switch on the ISC motor.

This code was driver induced and is a FALSE code and there is no testing to do.

You need to have someone physically watch the ISC motor for proper operation.