While playing around with a scanner tool (on my 90 K5 350 fi), I came up momentarily with a vehicle speed sensor code that said that it short curcited. the idle began to rev high and then went back to normal. I cleared all the codes and it hasn't acted up since. I think that this might be contributing to my delayed/irratic shifts. Has anyone had one of these go bad? Where are they? Can you get the new speed sensor at any normal auto parts store? Thanks for reading and for all the help!!!