Hey guys, im looking at buying a 1993 2.3L HO LX coupe..what should i be careful of..and with my 86 2.3L LX everyonce and a while no0t very often it will start knocking and blow smoke..usualy blue/white..what could cause that? its usualy when u stop at a light or a stop sign that it happens.

and with the 1993 is the HO an expensive engine to maintain? and is it a good engine? i believe it does the same smoke thing? any tips?