the problem causing the plugs to foul is the plugs. bosch platinums are too cold for the engine, and many others, and will foul and cause no or poor starts. i'd go for just a cap and rotor-bosch only, wires-oe or bougicord only, no bosch, and either bosch or ngk plugs. i've fixed a bunch of poor running cars by using the right plug, not what's on sale. as far as your other concerns, the coil or icu can fail, the coil more often, BUT, it's rare for either. cross that bridge when you have to. good luck, chuck.
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