2008 Mitsubishi eclipse GT wont start after changing plugs the throttle body was unplugged with battery still connected some electrical appliances work but main ones don't ex: power windows, radio, headlights but the odometer does how do I fix problem

SOURCE: Change Spark Plugs on 2002 Mitsubishi Eclipse GT V-6 (3.5)

First off, you don't have to remove the WHOLE INTAKE MANIFOLD. If you look closely, you'll see that the intake manifold is a two piece setup(Upper Intake, Lower Intake).

You will need a new gasket after removing it. Don't be cheap either, get one that is reusable.

First, remove the air intake from the restrictive airbox, then remove the bolts from the center portion of the intake not from the heads!!!(This is not a Chevy so the car's parts made on this intake is for people like us to work on)

After removing the "Upper" intake and everything else including any hoses, you may successfully remove the intake and lay it aside and guess what, you can replace spark plugs.

Replacing the front three is a no brainer so I'm not getting into that LOL. NOW, I HIGHLY suggest to go ahead and spend the extra $20.00 or $30.00-$35.00 if you was performance gains and better/longer performance usage, and get you some plug wires too. You only want to do this once (For a long time).
Do not use any other spark plug but an NGK brand, NOt an AC Delco although they call for it too, I wouldn't go with them. These stout V8 killer motors produced were specifically made for high performance.

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SOURCE: How to change the spark plugs on a 2000 mitsubishi

front ones are simple you just pull the rubber boot off of it and screw it out. The ones on the back are a pain. you have to take the intake off to get to them. I would recommend a repair manual from an auto parts store.

SOURCE: Oil change mileage interval 2008 eclipse

approximately ever 3000 miles or every 3 months, which ever comes first