THEORETICAL ideas are fine in THEORY. :p Stuff that works in reality: changing the oil, the plugs, decarbonizing the engine with a product tht goes in the gastank... An INEXPENSIVE bunch of stuff that usually WORKS to pass inspection. Total cost Tecron $10, Plugs $8 to $40, oil change $20 (you need to do this anyway) and a new filter $15............ and some spirited driving to make the engine cleamer do it's job well ............
If you want to buy a whole lot of expensive parts: MAF (mass air flow), new oxygen sensors (Contiques have FOUR)... go ahead spend $1,000.... and then find out you don't pass!!!!!!! Cuz what was wrong wuz' a cracked vacuum hose!!!! $15 including labor!

:rolleyes: