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Since your saying optispark, I'm going to guess it's an lt1 year. Personally, I wouldn't even look at them and go more for a 98+ for the LS motor. **this coming from someone with a TPI motor in one of their cars.
To answer your question though, optispark will always be a huge pain in the ass for you. There are better aftermarket ones out there but it's going to be totally random when they go out and when they do, it's a pain in the ass. I wouldn't worry about a catch can either. Do a normal tune up.. plugs, wires, belts, fluids, filters, ect. With it being a Convertible, obviously check the rear window and around it for any holes where water could leak into it.
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