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You need to clean the IAC again and also the throttle valve and bore, use only CRC brand Throttle body cleaner. After they are thoroughly cleaned disconnect the battery for 5 min's and then drive the car in varying condition for a few days. If that doesn't cure the issue you have more serious problems and will need a scan tool to look into the readings from the MAF, TPS and ECT sensors. High idle cold start is normal then slowly dropping after a few minutes. I assume you never had a check engine light. Correct?
Might be a leak on your brake booster (this will most probable give you a hard brake pedal or a "sucking sound " when applying brakes) also check the vacumm pipe from the engine to the brake booster. It might have a leak, so when you press the brakes it influences the air mixture.
Get a friend to open the hood and look at the engine go up or down in the engine compartment when the brakes are firmly applied and switching between reverse and drive. Look for the motor mounts for behavior where tears exist in the rubber.
You don't disconnect anything on today's
vehicles, even with the key on
Put in a new battery,start the car, warm it up
& drive it for awhile & maybe you will get lucky
& it will complete some of the drive cycles & run some
monitors ,you know nothing about & it will be fine
If not, your mechanic friend should be about to stop
by with the bosses scan tool & help you out
Try to rev the engine while at neutral if you get the same vibration to pinpoint if its from the engine or the drive shafts. If the issue occurs at a certain rev it may likely be the variable valve unit. Check if possible if you can get errors from the computer.
If the engine light is flashing then it has a severe misfire, have the engine light scanned and it will tell you which is the misfiring cylinder/s. I would advise you to replace the spark plugs also
check your camshaft and crankshaft sensors. When defective, it may cause stalls, misfires, loss of power. Also have check the engine for vacuum leaks. Hopefully this helps!!
Your problem sounds as if the thermo sensor....which controls the air
fuel ratio when engine is cold....is faulty. It is a common fault on
this model.
This is not an expensive part, and takes only a short time to fit.
Good luck
John
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