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If an alternator is going bad it can cause a rough idle in a 1993 Subaru Legacy. Cold temperatures in the winter can also cause a rough idle in the Subaru Legacy.
throttle body or idle air control value
Almost all GM products idle rough when its cold but, if it continues it may be the tps swich.
The choke mechanism on your 98 Explorer could be sticking. The EGR valve could also not be functioning right. Either of these issues could cause the rough idle problem.
why does my vr commodore idle rough when at complete stop
Why does my 2001 kia sportage idle rough?
rough idle smell gas
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.
It may be in need of a good tune up.
The Dodge ram 1500 rough idle can because by a bad spark plug or spark plug wire. The rough idle can also because by a bad camshaft.
The rough idle could be caused by a clogged egr valve or a stuck choke, among other things. Start by cleaning the egr valve then check the choke. Check the computer for possible codes to show other problems.