Saturn Forum - Saturn Enthusiasts Forums - Car has rough idle and low rpm after replacing spark plugs

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Car has rough idle and low rpm after replacing spark plugs

I recently replaced my spark plugs on my 09 Saturn Aura XR 3.6L v6 using Bosch double iridium spark plugs. When I start my car, it has a rough idle and all of a sudden drop down to a very low RPM like around 500-1000 or so. Much lower than usual. I know that it's not an issue with the spark plugs themselves because this product does not need gapping as it's been preset to fit Saturn Auras. I made sure that the plugs are in the right ignition coils. I don't know what could be causing this. Any thoughts?

The plugs.

Use OEM PlugsAlways check the gap.

https://cimg8.ibsrv.net/gimg/www.sat...6200c3bad3.png
RockAuto
https://cimg7.ibsrv.net/gimg/www.sat...434f9cb86f.png
GM Parts Giant
Spark plug interchange tables are as you have noticed, are often useless.

I agree with derf. I wouldn't put Bosch plugs in a lawnmower, let alone my car. They suck.