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Find another mechanic.. First, if the harness is bad, it is almost impossible to diagnose a bad computer. I diagnose cars. I start with power and grounds first. Then check wires for continuity. Check sensor and actuators for resistance. I get 1 hour to do this. Usually do it. Sometime the harness is bad. it requires more time. Being a ford... I would start with cleaning the maf sensor and the throttle body. Look at replacing the fuel and air filter.
The car is designed not to spin it's wheels when taking off. If you want to make it do that you need to either change the powertrain programming or replace some powertrain parts.
This sounds like a normal condition.What happens is the cold start emission reduction component monitor(software program in the computer) is running.
Cold Start Emission Reduction Component Monitor
The Cold Start Emission Reduction Component Monitor was introduced for the 2006 MY on vehicles that meet the
LEV-II emission standards. The monitor works by validating the operation of the components of the system
required to achieve the cold start emission reduction strategy, namely retarded spark timing and elevated idle
airflow.
When the CSER strategy is enabled, the idle air control system will request a higher idle rpm, elevating engine
airflow. While this CSER elevated airflow is requested, the low airflow test compares the measured idle airflow from
the MAF sensor to the commanded idle airflow from the idle air control strategy.
I just came up with that exact issue in my 2003 with 98K police crown vic. And the last time I had this issue in a 2001 police Crown vic it was the crank shaft position sensor. A $20 part and about 30 mins to put it in. located near the bottom of the engine. I had to un bolt the A/C compressor and push it out of the way a few inches to get to the sensor. If you have about 100K mile on it and its an idled heavy police car, this sensor should be changed out anyway. It can leave you on the road dead and some dealers have a hard time find out whats wrong as the OBD 2 does not see it as a problem when it goes bad or becomes touchy as I think mine is.
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