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clean out the idle the idle valve on the inlet. remove and clean the unit. also replace the air filter and clean the maf/map sensor before starting engine after air filter changed as dirt from the air filter can coat the maf sensor and this will give a wrong reading to the ecu.
Oil Change & Filter
Transmission Fluid Change & Filter
Fuel filter
Air Filter
Plugs, wires/boots, cap & rotor if applicable
Clean the MAF sensor with MAF spray.
Clean any debris out of the air intake box.
Run some seafoam in the fuel to clean injectors.
Check tires & pressures.
I would start with cleaning the idle air control, then would clean the mass air flow. Also check the air filter. I have ran into oil soaked air filters on the Focus.
New spark plugs, oil and oil filter, transmission flush and fill, fuel filter, air filter, coolant flush and fill, clean throttle body plate and bore, clean the MAF sensor, replace any loose or cracked vacuum lines, PCV valve, new air filter, new battery.
99% of the time all you should ever need for a tune up is new spark plugs, and a clean air filter and throttle body. But since your inquiry indicated "major" I gave it more critical thought.
MAKE SURE YOU HAVE A CLEAN AIR FILTER, IF IT CLEAN , THAN YOU HAVE A DIRTY AIR FLOW SENSOR , THEY CAN BE CLEANED WITH BRAKE CLEAN ITS IN LINE AFTER THE AIR FILTER JUST CLEAN THE PICKUP WIRES , OR REPLACE IT
Probably a very dirty air filter and Mass Air Flow (MAF) sensor. Replace your air filter, and clean your MAF sensor with MAF cleaner. You can find it at any auto parts store. Disconnect your battery for about 10-15 minutes to reset your computer. This will allow the computer to "re-learn" the settings with clean injectors and air filter.
Six cylinder: The air cleaner element is inside the air cleaner housing on the left side of the engine compartment. (It has a large hose connected to it). To replace it: Disconnect the hose from the air cleaner housing cover with flat-tipped screwdriver. Loosen the four bolts, and remove the air cleaner housing cover. Remove the old air cleaner element. Carefully clean the inside of the air cleaner housing with a damp rag. Place the new air cleaner element in the air cleaner housing. Reinstall the air cleaner housing cover, and tighten the four bolts. Connect the hose to the air cleaner housing cover with a flat-tipped screwdriver.
u don't clean them, u replace them.
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