Its not really a problem I dont think but when I first start up my car to let it warm up after about 4-5 mins of not touching the gas or anything it sound like a problem with a vaccumm or so. The car idles at 2g when cold then when the problem starts the idle bounces from 2g to 1g to 2g to 1g over and over. Like 2g for a sec then 1g for a sec then 2g and so on. As its doing this the battery light flickers or stays on. If I drive it in about 2 mins it stops and idles normal with no problems or if I just turn it off and restart it its fine. I dont think its a problem its just a question about whats going on and if I can stop it or its normal?

 

Check your grounds, one might be loose. Thats what it sounds like to me.