The gas gauge also shows different amounts of gas every time i start it
The stall problem could be a faulty idle air control valve or dirty throttle body. The computer uses the valve to adjust base idle speed depending on the load on the engine.
SOURCE: 2005 Mercury Mountaineer shuts off
Could be a number of things and the information is a little vague. Does it do it when cold, warm, after driving for a distance etc. It might pay to have some one run a diagnostic machine on it. The cost for the test could actually save you money. Just make sure they have a good reputation.
SOURCE: 2005 Mercury Mountaineer..gas gauge including
You have to have a professional scan tool put on
most vehicles today, to look at the systems data
If I had your truck I would start there
Then I could do nothing without wirng diagrams,
just to see the systems it has & give me a guide
to start some testing
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