2002 Kia Sportage rough idle and hard start

Had car checked out. Report said, low compression.80, 60, 30 and 30. Said, it should be 188. Said, looks like head had been off recently. "Probably ran hot and sprunk the rings".
It starts kinda good until driven for about 30 minutes then doesn't want to start. Also, it idles rough until driven for about 45 minutes then its not as bad. It has excellent power when driving. They said, it is not equipped with an egr and the idle control is good.
I paid them 180.00 to tell me I need a motor. Now I am broke and facing how to get the money to get a new engine.
What do you think.