How can I remove the intake plenum on a 2003 mitsubishi eclipse gt?

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: Spark Plug Replacement

I changed my spark plugs and wires myself two days ago after a quote of around $550 from a local repair shop with welcomed success. It's really high because of the time it takes to do this job. I took my time and did it in about 5 hrs. The answer given for the website is a great source and helped me through a very tedious process. My best advice in addition to that is to have some 1" tape (i used flourescent green for visibility) and a sharpie and mark EVERY STINKING WIRE, HARNESS, PLUGS AND HOSES. Also it helps to make a small diagram of the bolt patterns and varoius lengths and placement of each. I started with numbering the bolts and lettering the wires and harnesses to combat confusion. I hope this helps anyone taking on this hideous task.

SOURCE: I have a 1998 mitsubishi eclipse rs and the check

YEP BAD COIL CLOGGED FUEL INJECTOR AND INTAKE LEAK TO CYLINDER 1.TRY CLEANING FUEL INJECTORS.IF STILL MISFIRE DO A COMPRESSION TEST TO THAT CYLINDER YOU COULD HAVE A MECHANICAL ISSUE.

SOURCE: 2004 eclipse gt car ran idle you smash gas cuts out you give it lil gas it works fine but it back fires replaced timing belt distributor plugs wires and plugs maf

Fuel or Air obstruction. Check fuel filter and air filter. If problem still not resolved, take it to a shop and have them pressure test your fuel pump.