Starts but will cut off! on 2000 Ford Taurus

It started a few months will start but it cuts off if i take my foot off the gas. When it warms up its ok. I had the spark plugs changed because i was told it was misfiring and had the fuel filter changed because it was dirty. If it doesnt warm all the way up it will jus lose power, shake a little, and cut off. I have put a lot of money into this car and i am gettin fed up, what else could it be????? And the dash board lights dont come on until its warmed up either!!!! what is that???? And i was told the gas is "too yellow"???? Whats that?? sorry i know i have a lot of questions but as u see i have a lot of problems. Thanks

Asked by for the 2000 Ford Taurus
the idle issue could be a IAC motor. common failure. easy to have it checked.
dash lights sound like a ground proble. i would clean all the ground wires around the battery.
the gas could be some additive oil companies add to there fuel.

Roy......Thank u sooooo much! i will b sure to get those checked out asap!
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2002 ford Taurus wont stay running anyone have the answer?