on the 1996 cirrus can the crankshaft sensor go out after 9 months?

You should get the vehicle scanned for any trouble codes to verify that it is actually the crankshaft sensor.

did it didn't pick up anything. oil was in plugs replaced wires plugs caps dist, vacuum all excess out check for air leaks none ,the only thing i can recall was buying a new sensor from auto zone 9 months ago when i had problem with it stalling worked great , then last week stared misfiring change all i could.but still a little ruff ?

So it does run? But just a little rough at idle, or at all speeds does it run rough....?

no not at all speeds , but if you hit 60mph you get some spiting?

Well it is not the crankshaft sensor or the camshaft sensor. If they were bad, the engine would not run. May want to do a compression test on the cylinders to see if there is a low one. All cylinders should be within 15% of each other. Also try running some fuel injection cleaner threw the gas.

will try thanks ,i'll let you know what happens.