Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome! My name isCustomerand I can assist you with your question. The most common cause of this condition is a bad fuel pump (fuel pressure too high or too low), a leaky fuel pressure regulator or a bad mass air flow sensor. All are very common. Another thing would be if the air intake snorkle from the mass air flow sensor to thr throttle body is cracked or ripped in anyway that would allow air to enter the engine that is not accounted for by the mass air flow sensor. Also, be sure that it is nice and tight on both ends (at the throttle body and air cleaner assembly).
Some other less possible causes are a vacuum leak (which is after the throttle plate or throttle body) lazy idle air control motor which is located on the throttle body (sometimes it gets slow or weak over time and causes these sort of idles issues), bad TPS sensor, oxygen sensor or engine coolant temp sensor.
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