I need to replace the spark plugs on a 2005 Pacifica with a 3.5 l engine. Do I need to take off intake to do this. Also, besides spark plugs, what else will I need to buy/replace at the same time. I ssume if the intake comes off, I will need some new gaskets.

I have had this problem on one car where the inside of the gear has detached from shaft , another where the distributor had mal alighned its weights

Pull the cover of the top of the engine. Remove the screws that hold the intake manifold to engine. Remove bolts holding anything to manifold. Lit it up toward drivers side of engine your front plugs are right there under the coils and the rears are behind the manifold under the coils

Replaced the one on my 2005 Pacifica, 3.8L. There's not easy way to replace it unless you remove the intake, which is additional work. When I did the work, I didn't take the intake off and basically had to lay on top of the engine and reach with both hands around. If you have a few extra bucks, it's worth the time and hassle to pay someone else to do it.

You are in luck you can fix both at the same time. Disconnect battery Pull off engine cover. Remove air cleaner housing and tube. Remove speed control and accelerator cables remove every bracket from the intake manifold. Remove the ten or so screws holding the intake on Remove dipstick tube bolt. Remove any wires and hoses. Lift it off and that is where the front 3 spark plugs are. Unbolt coils on top of each spark plug and 1/2 turn and pull off. Blow or vacuum everything from the spark plug tubes. Spray penetrating oil down by the plugs and let it soak. Turn the plug a 1/2 turn then turn it back down then out then in so the threads clean themselves remember they were in there for 100,000 miles. Make sure you replace them with platinum or iridium plugs

the map sensor is located at the top front of engine, it has a square plug with a wire lock, mounted at top end of intake manifold.

If you are looking at the engine from the front and the large hose is at the bottom right the tightening sequence is from upper left to right 6237 bottom left to right 5148 just like I typed it torque is 250 inch pounds on lower intake and 105 inch pounds on the upper intake. So when you look at those numbers you tighten 12345678 in that order to 250 inch pounds in 3 increments then install the top intake.

Buy a Haynes Manual for your car

See my "How To" and "Tips" on how to replace spark plugs on a 2002-05 Kia Sedona.

Jay from Ma,
You have it backwards the rear three are accessable with the front three being under the intake. To remove the intake simply remove throttle body and aproxamently 15 other bolts.