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Why does a 1991 firebird 3.1 idle fine but when put into gear it wants to stall out?
Wiki User
∙ 15y ago
I have a 1990 firebird 3.1l engine.I had the same issue wherein it will idle fine,but when u engage the gears,you will notice it's drop in rpm.I replaced the thermostat first since temperature wasn't going up,then I tested the EGR which failed amp readings,then last would be the MAP sensors.That fixed my problem with the car.After all three parts were replaced,It ran fine and running on 700rpm on idle. I have a 1990 firebird 3.1l engine.I had the same issue wherein it will idle fine,but when u engage the gears,you will notice it's drop in rpm.I replaced the thermostat first since temperature wasn't going up,then I tested the EGR which failed amp readings,then last would be the MAP sensors.That fixed my problem with the car.After all three parts were replaced,It ran fine and running on 700rpm on idle.
Wiki User
∙ 15y ago
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