The other day I started my '87 and after it started, the starter stayed engaged. So I turned the ignition off and removed the key and the truck was no longer running but it continued to crank and crank and crank. I scrambled around for a wrench and unhooked my negative cable which obviousely stopped the cranking. Hooked it back up and for the last 10 starts or so its been fine. It happened to my wife a couple weeks ago and toasted the starter so I replaced it. Also last month I had the ignition apart to replace the broken ignition rod in the column and threw in a new lock cylinder. Any ideas on what could cause this? Maybe replace the fender mounted relay or am I gonna have to crack the ignition back open? Any ideas?