I have a 98 Ranger XLT 4x4 4.0 and it idles a little rough in park (around 900-1100rpm) but when I reach a constant speed, be it 35 mph or 70 mph, it starts to get rough again, and a little jumpy. When I'm accelerating or decelerating it's fine, and when I'm just coasting there is no problem, but at speed it's rough. Any ideas on what could be causing it? I cleaned the MAF recently, but I still need to clean the IAC.
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