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I have to ask, how long since a tune-up? Are there any applicable trouble codes?
The basics for a rough idle, check for a leak of some kind, fuel--egr--vacuum leak.
/Clean/check the throttle body and idle air system. Check anything that has to do with airflow, maf--map--tps, where applicable.
What is year and engine size?
Without trouble codes you are fishing in the dark. If the engine has a cylinder that is dead at idle from a fuel injector or ignition problem, it should have a code for a miss on that cylinder. A mechanical problem like a burned valve could cause the problem without setting a code. Have you checked compression on all 4 cylinders ? ?
You will have to get the trouble codes read from your car, to know exactly what is causing the check engine light to illuminate and the rough idle. Most major auto parts stores will read the codes and give you a report printed out, for free.
There could be many issues. These codes read your engine is running too lean. Check : all your vacuum hoses for leaks, PCV valve and hose, MAF sensor. This may require an experienced technician to figure this out. Hopefully I help'd!!
U need to have the engine trouble codes read. Most parts stores provide this service for free. They can recommend what should be done to fix the problem after they scan for codes. Any further info needed, u can post any ? here.