We have a 190E that we are using for chump car and the key broke off in the ignition so we decided to go with a toggle and push button. I marked things so I know what colors go to what pins on the tumbler and I've found which one turns on the fuel pump and the one to make it crank but I can't get it to stay running. This car is an '89. Did Mercedes have anti theft systems at that time? What could I possibly be doing wrong that's keeping it from running?