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Please read entire answer!
You don't adjust the idle, the computer does this for you.
If it will not idle down, usually not below 1500 rpm, you very likely have a cracked or broken "EGR" tube. This tube runs from the exhaust pipe from the EGR valve through a fabric insulating cover under the intake manifold. It will be cracked under the fabric cover.
I just blocked mine at both ends with metal plates, this is illegal in many places!
"The Fiero Store", an on-line supplier, has replacements.
If this is not your issue you will need to have your vehicle scanned with a scanner that will show actual sensor and computer activity.
What else can I help you with?
Is a 1986 GT Fiero engine compatible with a 1987 GT fiero without modifications?
Yes
How do you replace side windows on a 1986 fiero gt?
how do you replace side windows 85 fiero
Where can you buy a new or used latch for 1986 Fiero gt?
eBay
Where is no 1wire on distributor cap on 1986 fiero gt?
V6 or 4cly. ?
Where can you buy a new or used door latch for 1986 Fiero gt?
at The Fiero Store, NOTED ON LINE RETAILER.
How many gallons of gas does a 1986 Pontiac Fiero GT hold?
13gal.
What is the brand new price on a 1986 Pontiac fiero?
The 1986 Pontiac Fiero GT, was priced at $12,875-$12,999 which was nearly $4,000 more than the base model.
How much oil do you need to put in a 1986 Pontiac Fiero GT?
4 Quarts
Is a automatic 1986 fiero gt better then a manual 1986 fiero 2m6?
The GT is cooler The 5 spd will get better fuel mileage and better racing times The auto is easier to drive, smoother and all around a more pleasant car.
0 to 60 acceleration time 1986 Pontiac fiero GT?
7.1 seconds stock
What is the stock horsepower of a 1986 Pontiac Fiero gt 5 speed?
The 2.8 V-6 engine was first used in the Fiero in the 1985 GT. It was called a 2.8H.O. engine and had 140 HP. It was the same in 1986. However, the same engine was used in other GM cars but had 130HP. In 1988 Fiero horsepower was reduced to 135. how ever they say 140 HP but dyno tests proove that the 86 fiero gt has 200 HP
How do you set the idle in a 2001 mustang gt?
The idle is computer controlled
