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My 1992 XLT 165,000 miles is using coolant, not a lot, quart a month tops. I replaced radiator when I bought it 5 years ago. haven't run leak test yet, Odd thing is that the overflow remains full. 2 Questions -Why isnt it drawing coolant from the overflow tank? - How do you diagnose intake...

LAst week, exp was running rough,on the way home from work, I found that the plug on vacuum port at rear of plenum had fallen off, I re covered it, and it runs OK. NO Check Engine Light. But, when it starts, the idle runs high for about 20 seconds, then kicks down low and goes lower till...