Strange ticking noise getting worst

Hi, I'm new, and was wondering if someone could help me out.

Car :

Excel 2000 model
56,000 kms

In the morning when cold, everything sounds fine, press the gas, and let go creates a longgggg ticking sound for about 5 seconds or more. When I first bought it 4 months ago, the ticking only lasted for about 2 seconds, now it's getting worst.

I've changed oil twice, and flush twice, in the hope of cleaning any gunk in there, to no avail. It's still ticking, while in gear, off gear, after 1 hour driving too!

Please help.

Thanks

Hi,
The long ticking noise i think has to do with the hydrolic lifter that is used in excels. Oil changes should clear it up a bit, but the best thing to do is to add some lifter fluid in there and it shouldnt tick for more than a couple of seconds when you start it up. If this doesnt work, get hyundai to look at it and see if there is anything they can do.
Nathan