How do you replace the spark plugs on a 1999 Mitsubishi Montero Sport LS?

YOU ARE GOING TO HAVE A HARD TIME YOU ARE GOING TO HAVE TO TAKE OUT INTAKE MANIFOLD TO GET TO ALL DRIVERS SIDE PLUGS AND THE ONE ON THE PASSENGER SIDE GOOD LUCK

what kind of answer was that, is their anyone with brains out there

***the person is 100% right. I just had my brother in law change my plugs and wires, Auto body wanted to charge me 500.00 dollars, because of the difficulty

Go to www.monterosportonline.com and they will give you detail by detail including pics. Best of luck because there is a lot of work to do.

Yes correct the intake will have to come off , but i am trying to find out why there may have been sludge on the spark plugs is it normal because they are located in the valve cover or not?

Yes the plugs go thru the valve covers. if there is oil or sludge as you say on the outside of the plugs,you will ned to change the valve cover gaskets felpro's gasket set comes with new orings for each hole to prevent oil leaking thru onto the plugs.

This tune up isnt for the weekend oil change guy but you can do it if you take your time and have a good memory........theres alot of unbolting, wire harness unpluging and vacuum unplugging as well! ya might wanna take pics as ya go so everything goes back together correctly. Mark all the spark plug wires at the coil so ya know where they plug it at cause once its together ya cant tell who is who! The firing order is on the wrote on the intake.