I had the same issue, and I found out that the timing belt was stretched, and the timing started to slip slowly. My truck would idle at 100/200 rpm, puff black smoke and just wouldnt idle normally. So I readjusted my timing. And everything is fine. Besides the fact I have to still replace the timing belt. I had no power before I did it. I would be going 35 mph by the time I hit 3rd gear. And shifting into 4th. But once I changed it. I had good power. Hope it helps
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Sunday, June 6th, 2010 AT 8:08 PM