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NEVER replace just the cap and rotor portion of the opti. It's not worth it, especially considering the problem may not even lie in those pieces. It could be an optical sensor failure.
Replacing the opti is fairly easy.
Drain the radiator.
Remove the intake ducting, radiator fans, crank pulley, water pump, then opti. Once you have some experience you can have an opti out of the car in about an hour.
I believe the cheapest going rate for a new GM opti is from Jason Cromer at Sam Taylor Buick Cadillac. 877-726-8295 The 92-94 non-vented units goes for about $260-270 now.
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