Phit, you're right the electrical connections have a huge impact on the way the vehicle performs. The numbers are there for reference only. If anyone does happen to actually use these suggestions, the best thing to do is perform the easier ones first. You can do the majority of them in an hour or less.
I have noticed that many people want someone to troubleshoot their vehicle without opening the hood. If you drive any older vehicle, you are going to have to work on it... or pay someone. This was the intent, give people a way to save some money. I still see folks changing sensors willie-nillie. I suggest keeping any parts changed prior to checking all this stuff. It will give you a cache of spares.
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