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I am assuming you have a 3.1 v6 engine the spark plugs are 3 right in the front next to the oil dipstick and above the exhaust manifold you can follow the wires from the coil to find each plug. The other 3 are on the back side of the engine and can be difficult to get to. Easiest way is to remove the upper engine mounts and tilt the engine forward a few inches with a ratchet strap or something to gain clearance. MAKE SURE it is secure because your arms will be back there. And those three plugs are in the same location as others just on the opposite side of the engine.again just follow spark plug wires down to the plug.
The spark plug firing order is ( 1 - 4 - 2 - 5 - 3 - 6 )
The distributor rotor turns CLOCKWISE ( 1 - 4 - 2 - 5 - 3 - 6 )
The marked # 1 position on the distributor cap faces towards the firewall and slightly towards the passenger side
The engine cylinders / spark plugs are numbered : passenger side of engine , front to rear , 1 , 2 , 3 and drivers side of engine , front to rear , 4 , 5 , 6
Obviously, the front three are fairly easy to reach. The rear three are the real problem. The easiest way to do the rear three is to jack the front of the vehicle up, crawl underneath until you can see the back of the engine from the ground, get real comfortable, making sure the engine and exhaust are cooled down, reach your arm up and pull the boots, very carefully.... then replace the spark plugs. You will not be able to see the plugs themselves, but this seems to be the easiest way to change them. Make sure you have a swivel spark plug socket and extensions and replace the spark plugs with platinum plugs so you can get another 100,000 miles and make sure you have anti seize so you can remove the plugs again in the future. The golden rule is that the engine has platinum plugs in there now and there good for 100,000 mile, if there are no misfire try not to change them unless you think your close to the end of the spark plug life or the check engine light came one to indicate that there are misfires. Good luck and hope this helps.
carefully remove the coil pack with a deep 10mm socket and unplug the 2 connections on the pass side of the coil and just lean it over to the driver side of the car and you will have access to the rear of firewall.
There is 1 screw on top of each spark plug cylinder. Just remove the screw (I hope you removed the resonator first). The 2 plugs back towards the firewall are a little tougher to reach, just ensure when you put the new plugs in, that you do not crossthread them!