Sump plug on 2005 Mitsubishi outlander turns but doesn't come out.

SOURCE: RPM to low (700rpm) mitsubishi outlander 2.4L 2005

Your throttle body likely needs cleaning.

Take the intake hose off and using throttle body cleaner or brake cleaner, spray a rag and use our fingers to clean the gunk off the throttle plate and the contacting area of the inside of the throttle body.

SOURCE: Change spark plugs

Remove the intake baffle if equipped (5 10mm screws), then remove the coilpacks/wires (10mm bolts), then remove sparkplugs (use 5/8" socket)

SOURCE: need mitsubishi outlander 2005 drive belt diagram

Here you go, please be sure to rate me if you find this answer useful!

SOURCE: My 2005 Outlander won't start. It turns over, but

The first step you have to take is to determine if you have an ignition or fuel problem. You must do this to know which direction in testing to go. After you find out which problem you have check your fuses and fuse links with a test light to make sure all circuits are working from that point. After that depending on your confidence in dianognostics and experience in auto repairs you may want to take the car to a shop or let us know the results that you get from the checks then we can guide you on which tests to run next.

SOURCE: for 2005 mitsubishi outlander which octane (87, 89

lower octanes will not hurt your 2005 outlander truck at all... the engine computer adjusts to the lower octane... you may notice a slightly higher fuel consumption with the lower octane fuel but the money you save on lower octane fuel offsets the mileage.