I unbolted the main ground wire at the connection point on the air pump bracket. The mating surfaces were a bit rusty, so I ground them down to bare metal and reattached. I read on another thread ( http://community.cartalk.com/posts/list/1286411.page ) where a guy ith a '94 B250 had a stalling problem that was due to a corroded ASD relay pigtail and a short in his ignition coil wire. I will double check both of those things hopefully tomorrow.