Engine Vibration at idle and uo to 15 mph

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Mi. 66800, I have an engine vibration at idle and below 15mph coming from engine. Vibration goes away when accelerating beyong 15mph. Vehicle purchased new in 2004 and has no engine, transmission demage\failure. Recent repairs include, dealer replacement of rear ABS sensor and reprogram of computer. Another mechanic changed out plugs and wires, compression check done on engine (all cylinders ok), ran through 2 bottles of concentrated fuel injector cleaner. Other than vibration run really well. What could be causing this vibration and what could I expect for a repair bill. Thank you all for your kind attention and assistance.