Ford Repair Questions? Ask a Mechanic for Answers ASAP
How high does the engine rev?How long does it stay up there?
How high do the rpms go when it does it?
First, it's fairly normal for the engine to jump up in speed on first start although this seems a little bit high to me.
Usually when this happens it's a result of either the mass air flow sensor or the IAC. I would try cleaning the IAC (idle air control) motor. This is mounted to the top of the throttle body and held on with just a couple screws. Sometimes it gets sticky and can't adjust properly.. I actually owned one of these for a while myself. Take it off and clean it up inside with some carb cleaner, then reinstall it. Do not turn the key on while you have it off the throttle. If it fixes the problem you can continue to drive it with the old cleaned one. I was able to get another 80k out of mine without a problem.
If it doesn't solve the issue. Then try unplugging the mass air flow sensor before you start it and see if it stays under 3k, if it does, then replace the maf sensor.
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Hello again, I haven't heard back from you so I thought I would find out if you needed further assistance with this?