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Do not use denatured alcohol. To pass the emmissions just do the basics you need to do anyway:
Plugs
Air filter
oil change
flame trap
rotor dist cap if your car has them
Fill up with premium fuel
All this costs less than $50, and are regular maintenance items.
If you have time, also clean
throttle body
IAC clean leaves debris from intake
battery terminals - replace battery if it is more than 4 years old
When I get an e-test, I fill up with premium, and do an Italian Tuneup. I run the car in low gear so the rpm's are 4000-4500 for ten minutes. This clears the crud out and frees the valves up. Then I go to the e-test facility with the car warmed up.
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