Engine Performance problem
1987 Mazda b2200 4 cyl Two Wheel Drive Manual 131700 miles
My 1987 Mazda B2200 will run fine while cold and then when it warms up it will stall at idle, sometimes right away sometimes immediately, unless I keep my foot on the gas. Also I have had to add coolant once a week since I have owned the truck(about 2 months), but there is no apparent leak. Checked the oil and doesn't look like I have a blown head gasket or cracked block. Any suggestions?