Need to be able to bump up the idle speed on the 2.4 engine.
Idle control valve should do this for you!! take it off giv it a clean if the same replace or add thin pipe from manifold to intake pipe between throtle body and air flow metre bypassing throttle body
SOURCE: Rough idle only when in gear.
The Air Idle Control Valve (IAC) may be bad or dirty with carbon build up. Check for loose wire, remove and try to spraying it with throttle body cleaner to clean the carbon out and dry it with a hair dryer before installing.
The other thing to look for to is stuck EGR valve. same process as the (IAC) as to cleaning it too. If both are beyond cleaning then replace it.
You can go to Auto Zone and have the car scanned for any DTC codes which would indicate any problems with the (IAC) and EGR's performance.
The other thing to that would make the engine shake at low RPM's is bad spark plug and wire or low engine compression, but that would give you problems through out the whole engine's performance.
Good luck and hope this helps, Start with the (IAC) and EGR as to cleaning and scanning the engine.
SOURCE: 2001 grand am se1. Rough Idle - Spark Plugs and Spark Plug wires
What engine? You need to have it scanned for codes. Autozone will do this for free
Testimonial: "thanks for your quick response!"
SOURCE: engine codes p1518, p0125, and p0420 for 2001 firebird
P0125 sets when engine coolant temp does not reach temperature for closed loop operation within a set amount of time.
May be a faulty sensor or thermostat.
P0420 Is related to a faulty rear 02sensor.
P1518 PCM & TAC module communication detected missing or invalid serial data.
If TAC related repair has been done, clear DTC & recheck system. It may be necessary to preform clear codes function twice to clear this DTC.
make sure starting system & charging system are functioning properly. Low voltage can cause this DTC to set. This should help. Let me know how its going.
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