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.
Almost all GM products idle rough when its cold but, if it continues it may be the tps swich.
What causes a car to idle good and run rough when you give it gas?
It may be in need of a good tune up.
This depends on the temperature outside and if your starting it cold. If you start it cold even in 60 degree weather it may idle rough for the first few minutes. You can solve this by letting the Wait to Start light to go out and then pressing the Throttle down slightly and letting off. This engages the high idle which should stop your vehicle from running rough for so long, as it lets the engine warm up faster.
Vacuum leek
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
i think it causes bad/rough idle
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MAF senso, or transmission fluid.
You broke it. Way to go.
brendalee