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Check coolant level to make sure it is full. Low coolant can cause surging idle. Also, check throttle plate for dirty/coking causing minimum idle to be affected. If throttle plate is dirty, clean with carb cleaner and retest
On some engines the icv is inside the intake manifold and is suppose to move open and closed to vent in extra air for idle. Sometimes they get carbon in the port and the valve sticks. WD40 will dissolve the carbon.
The Code can also mean the coil inside the icv is fried. A simple power off ohmmeter test can test the icv. Check for you tube repair videos
Look for vacuum leaks anywhere between the throttle plate/s and cylinder heads. Throttle body gasket or intake manifold gaskets could be bad. A vacuum hose could be bad. Also, try pinching the hose to the brake booster and seeing if the idle returns to normal. You can use aerosol carb cleaner to help find the leak. Spray a little around and listen for the engine speed to increase. When it does, you've found your leak.
You may also have a bad throttle position sensor and/or a bad coolant temperature sensor. Find a buddy with a scan tool and have them tell you what codes are stored. That should get you pointed in the right direction.
most likely its a vaccum leak, once it gets warm, the hose or gasket expands causong it to misfire, what you need to do is after it warms up, get a carb spray and spray around the engine slowly so you can notice the change in the idle, once you locate the change in idle area, thats where the problem is, good luck
ANY TIME YOU CHANGE RADIATOR ONCE YOU GET THE NEW RADIATOR IN PLACE.FILL RADIATOR WITH ANTIFREEZE CRANK VECHICLE UNTIL THERMOSTAT OPEN. WHEN YOU TOUCH THE TOP RADIATOR HOSE.IF TOP HOSE HOT THERMOSTAT OPEN.CHECK RADIATOR COOLANT LEVEL IF DROPPED ANY.ADD COOLANT UNTIL LEVEL QUIT DROPPING. WHEN COOLANT LEVEL QUIT DROPPING YOUR COOLANT LEVEL IS CORRECT. NO MORE AIR IN COOLANT SYSTEM OR AROUND COOLANT TEMPERATURE SENSOR COOLANT FAN SHOULD TURN ON ONCE ENGINE GET TO CERTAIN COOLANT TEMPERATURE.SEE IF COOLANT TOO LOW NOT ENOUGH COOLANT REACH COOLANT TEMPERATURE SENSOR. SENSOR CANT TURN ON FANS IF ITS NOT IN HOT COOLANT. WHICH DECREASE ITS RESISTANCE WHICH CLOSE OR GROUND CIRCUIT CAUSING COOLING FANS TURN ON.
Hi Code P 0217 does point to the thermostat but it also points to the wiring, cooling system, and the temperature sensor, to check the thermostat start engine then once the temperature gauge in the car reaches normal the thermostat should open and the top hose that goes into the radiator will warm up quickly as the thermostat opens, if the thermostat is stuck in it's open position the top hose will start warming up before the engine reaches it's working temperature, hopefully i have explained it clearly,