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Discussion Starter #1
So at stoplights My 12 Lx sedan will idle perfect but sometimes drop 100 rpm and start to send a small vibration throughout the car. After a min it will go back to normal and idle great. The needle never dances. Do I have bad fuel? That is what I am thinking.
 

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Maybe something is loading the engine like the AC compressor head pressure being too high while vehicle is stationary? If it's underwarranty you might want to have the dealer check it out before the problem gets worse.
 

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May be could be the radiator fan kicking in...
 

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Discussion Starter #6
What would cause my 12 lx sedan to idle at 600rpm not normal 800rpm

It has been doing it for over a month about 90% of the time at a traffic light. I slow down, it drops to idle but that is 600rmp. This causes the engine to vibe more then normal. Sometimes it tries and does correct its self back to normal 800rpm. Can't be bad fuel because I tried 4 different brands and no improvement. Bad plugs or something? New air filter didn't do anything.
 
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