2004 Dodge Neon

Electrical problem
2004 Dodge Neon 4 cyl Two Wheel Drive Automatic 63000 miles

i have a dodge neon and when your at a idle it runs rough and drops rpms when air or heat on and even lights it pulsates goes up and down. Everything works good when driving but at a stand still runs rough and everything pulsates on car? No check enging on at all had battrie checked and alternater and cleand fuel intake? Still bad. Put it on a machine and no codes come up? Let me know what you think it is?
December 16, 2009.

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