Where is crankshaft sersor located on 1999 gmc jimmy?

Well, darling, the crankshaft sensor on a 1999 GMC Jimmy is located behind the harmonic balancer at the front of the engine. You'll have to do a little shimmying and shaking to get to it, but it's not rocket science. Just make sure to disconnect the battery before you start poking around under the hood, unless you're looking to give yourself a little shock therapy.