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There's a few things that can be reviewed:

Your indentation and spacing are incorrect, use JSFiddle's TidyUp function to clean it up.

All of the e.keyCode == matches shouldn't be matched to magic numbers, but moved to a kind of enum or something similar:

var KEYS = {
 Enter: 13,
 DownArrow: 40,
 UpArrow: 38
};
// ...
if (e.keyCode == KEYS.Enter){

##suggList:

Don't sacrifice readability for a few characters: suggestedList is more than fine.

##console.error:

Instead of console.error, use throw instead: console.error('No sourceList provided for customAutoComplete') into: throw 'ACError: No sourceList provided for customAutoComplete'

There's a few things that can be reviewed:

Your indentation and spacing are incorrect, use JSFiddle's TidyUp function to clean it up.

All of the e.keyCode == matches shouldn't be matched to magic numbers, but moved to a kind of enum or something similar:

var KEYS = {
 Enter: 13,
 DownArrow: 40,
 UpArrow: 38
};
// ...
if (e.keyCode == KEYS.Enter){

suggList:

Don't sacrifice readability for a few characters: suggestedList is more than fine.

console.error:

Instead of console.error, use throw instead: console.error('No sourceList provided for customAutoComplete') into: throw 'ACError: No sourceList provided for customAutoComplete'