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Q: Having already replaced all before, to no avail, must I use brand engine coils? on 2000 Infiniti I30

I have been driving my 2000 Inf I30 with the engine light on for the last 10,000 miles. Less than 1yr ago I changed the en. coils to a generic brand coil, mechanic said it would be fine. now the problems are returning and now Im being told that the coils being bad killed the cat converter and it needs to be changed to. so this is a 2 part Q"
1. do I need to re-replace the engine coils with Genuine Nissan coils>
and 2. do I have to replace a cat converter ($600.) or use the "Liquid Solution cleaner" ($200.)?
Please advise, Sincerely thanks
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generic brand coils are a cheap product and prone to wear fast. suggest upgrade to performance ignition coil such as accel' supercoil(same type used in current ford mustang production line). these coils are a quality product that are more cost effective than OEM replacements and more dependable than generic brand.
rec. upgrade spark plugs to premium type.
rec. fuel system clean. ethanol treatment to 1 tank of premium fuel. made by sta-bil.
rec. upgrade conventional air filter to high air flow design(K&N).
rec. oil stabilizer treatment with next oil change.
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