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4 Hi I am ralph lauren bambini on line having an erratic idle problem Hi i am having an erratic idle problem on my 2003 1.4 Polo(Bby engine), the engine will stall and struggles to restart after having been driven.Simply leaving the car to idle and then blipping the throttle will also lead to a stall.The mechanics are not getting any fault codes.The map sensor has been replaced and the tb has been realigned without any change, tb has been cleaned as well.Even the o2 sensors have been replaced, however my understanding is that these should only affect the long term fuel trim.I am stumped as is the mechanic.Cheerswayne This could be an airleak after the airflow meter, any air dragged in here isn by the ecu and so not compensated for and can lean the engine out and can also allow the engine to rev up when not desired causing rough running. Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn.If the engine rev up you found your leak. Work your way through each ralph lauren bambini con cappuccio possible joint one at a time and you should find it.I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying and allow a direct blast of gas into each area, especially those difficult to reach with large implements. It also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel being delivered to the engine Might also be worth cleaning out the idle speed control motor / valve as these get clogged up with carbon and some brake cleaner washed through helps free things off. Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage.You www.ctrs.it can do a quick fault find if you unplug the meter and run the engine without it. If the engine condition is the same then chances are the meter or the connection to it is faulty Air leaks are very temperature dependent as gaps can open or close up as things expand with heat, so they can be effected by the weather and engine temperature. This leads them to be quite intermittent in the case of mild leaks Its also worth cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner ensure that the cleaner is one of the old fashioned, non eco type that does not leave a residue On no account touch the sensor wires with anything physical as they are extremely fragile I would(And have)Recommend your site to others i was quite satisfied with the quality of the information received, the professional with whom i interacted, and the quick response time.Thanks, and be sure that i'll be back whenever i need a question answered in a hurry. Stephanie p Elm city, nc Used your service this weekend with"Trecers"Help.Thank you, thank you, thank you.Replaced an a/c fan motor.Local auto zone had part.$15.00"Tracer"Fee and $40.00for parts, I saved several hundreds of dollers at a shop.I will Recommend you and use you in the future. David l. Richmond, tx 9 dollars, 2 hours of my time, and I drove away.Your diagnosis was right on the mark.Thank you so much.