Car starts then dies on 1990 Mercedes-Benz 560SEC

As soon as I let go of the ignition key, the engine will die. As long as I keep the key cranked the vehicle will run, any suggestions??

by in Campbell, CA on March 09, 2011
3 answers
ANSWER by on March 09, 2011
Sounds like the electrical part of your ignition switch is bad. probably a bad terminal or maybe a broken wire, to the ignition position of the switch.
ANSWER by on March 10, 2011
Ignition switch needs to be inspected fixed or replaced.
ANSWER by on March 10, 2011
It wound up being a shorted tachometer.