oil problems?

Concur! stick a gauge on it... if you really can't get one put a new sender in it... probably about done. IF you have it in neutral in or out of traffic does it do it? The reason I say that is in automatic cars in neutral the idle is higher in drive it drops to the 550rpms and some weak senders will flicker there. I think Manual cars are 450rpm? you could also after the car is warmed up slowly raise idle until it goes out, but not above 800 rpm...

Get one of those Auto Zone gauges there good just to have around any way.