when i start my car up it idles real low if i dont warm it up by accelerating it turn of or it will idle below 1500 the car will start vibrating sometimes it wont happen it also happens when i go to put gas in the car what do you guys think is the problem

 

i think normal idle should be at 700 rpms.

 

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engine b18c1 with skunk2 manifold the old one itr header short ram intake greddy evo exhaust
chipped ecu which i the previous owner told me it was a crome chip looks like one of those ebay chips it come with 2 step a