There are four (4) things that can set this
The rear deck lid plunger switch is under the hood in the engine compartment in the rear left corner. It is prone to broken wires and shorting.
Mine says, that means there is a door ajar.
Ajar means "slightly turned or opened", such as of a door.
There is no idler pulley on this year Fiero so you must mean Idle Speed. It is most likely that if the idle is high and it wont slow down automatically, 1500 or so, that you have a cracked EGR pipe between the intake and the EGR valve. There are replacements available on line from companies like "The Fiero Store"
If you mean 1988 and they are both notchies, yes they will.
The trunk lid is open or the trunk ajar switch has malfunctionedThe trunk lid is open or the trunk ajar switch has malfunctioned
fuel injected
a door in your car is not fully shut.
Door Ajar.
dash dash dash
If you mean the release, it is on the very left (under where your light swith knob panel is) part way under the dash. It lays flush and when you slide your hand forward you will feel a space towards the front and you pull it down and toward you. If you look under the dash you can see it. Kind of square approximately 3" square.
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a dash signal means through