Could be lots of things:
Idle control valve
Failed or failing spark plug/lead
MFA (Air/fuel mixture meter)
Automatic choke stuck open when hot
ECU (brain)
Defective coil pack
Etc etc
check fuse 22
Look for a hole in the PCV valve hose on the backside of the engine.
I am having the same problem, and poor acceleration!!
jerking speed 40 50
check pcv hose elbow for vacuum leak.
why does my vr commodore idle rough when at complete stop
Why does my 2001 kia sportage idle rough?
rough idle smell gas
A vacuum leak, a bad injector and if the check engine light is on, check the codes.
When the idle goes rough, you must idle the plugs. Else the car plugs roughly.
With mine, the rough idle was fixed by changing the spark plug wires.
YES it does. It should be close to intake.