zapoten

Hi, i have a 1989 v6 toyota warrior 57 000 mi and the engine have a ruff idle engine and consumed a pint of colant every 5 000 mi. Someone tell me that its probably the head gasket. Do you think its the head gasket, do you have these problem on your rig's. If you have done the job, how much it cost to you ? I have hear on the forum some stuff about burn valve... I fear that the bill for the repair will be high.