My 2003 expedition is idleing and running rough

Your truck has what is called coil in plug commonly known as CIPS. They are located on top of the spark plug boot. You have to take out small bolt that holds it onto the sparkplug. Then you can take out spark plugs. The CIPS are expensive (about 85-100 per cip). I ordered mine on the internet for about 10 bucks a piece and the were new. Be advised you may not need to replace all the CIPS. I only had to change 3 out of 8. Have autozone run a code check then you will know exactly which CIP or CIPS are bad. I would change all the plugs if you have over 60,000 miles on them. Additionally after you change the plugs your truck computer will have to "relearn" the firining order. The truck will run rough for about 3-4 restarts then it will run smooth. Getting the plugs changed took me 5 hours. Theres a lot of stuff in your way as you will see once you get started. The back 2 plugs on both sides are a real pain. Good luck !!

Are you sure the spark plug wires are on the correct spark plug? Recheck the firing order and spark plug wires. Additionally check timing on distrubutor

please tell me in this tune up you had new spark plugs put in? if check engine light is on there are some stored codes those will give you the suspect cylinder(s) check to see if you have plug wires if not there will be a coil for each cyl. pass. side of motor starting in the front working to the back or firewall cyls are 1,2,3,4 driver side same front to back 5,6,7,8 codes will be PO301 cyl 1. PO302 cyl 2. etc. get the code find the correct cyl. unplug little connector u will need a 7mm socket to remove the bolt holding the coil in place then pull up on the coil and boot.... if u have plug wires get the code find correct cyl and follow plug wire to coil pack in front of engine there will be two one on each side in front of engine...

When you know the symptom who needs codes?And if there was a code it probable say lean bank 02. why simple you have a misfire. the smell rich exhaust the shake and sputter in drive. 2 causes the Expedition suffer from ,An open EGR valve.If you can change a fuel filter and change a spark plug you can test this. when the engine is running and misfire at idle and the vehicle is warmed up and at operating temperature. Turn off engine. Go to the EGR is it hot to touch. because if it is it open and this the the culprit.Another misfrie is from COP (coil on plug.)When you change the spark plug where any of the spark boot torn or worn that spark can go through. Or even a faulty COP will do this .To find it you have the engine running and lift one COP out of the cylinder and listen for a engine drop if the engine RPM drop the COP is good if no change in engine the COP is bad. By the way 600rpm in drive is low

suggest try replacing the plugs with the old once.quite posssible faulty plug.

Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.
Randy

Remove coil covers,then coils,then plugs.

take the breather off and take a 10 mm socket to take the coil off easy to get to then take a 5/8 plug socket to take out plugs easy to get to,

make sure you put the right plugs in the fault is most likely the coil pack follow the plug leads from the spark plugs and you will reach the coil pack about £60

Was it doing this before you changed the plugs? This is coil over plugs correct? Double check you pugs and if it is coil over be sure to use die-eletric grease on the spark plug boots. Good Luck