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this might sound stupid but is your coolant level full ?

if it is then check your iacv i dont know what car you got but generaly its on the intake manifold either on the front or the back its got 2 screws on it and a 2 or 3 wire plug i forget and a couple small prestone hoses now what you do is with the car cold lol is take it off you dont need to undo everything just the connector and 2 bolts now in there is a small screen just check it out and clean it if its clogged .

option 3 Just do a quick check to c if you have a unpluged vaccum hose

and those r the 3 thing that i can think of that would cause a rocky idle hope it helps

low coolant level
clogged iacv
unpluged vaccum
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