1998 Ford Ranger • 154,000 miles

98 Ranger xlt 2.5 liter 4 cyl automatic 161,000 miles. Truck shakes a little and is slow and shakes when accelerating between 40 - 60 mph. Sometimes shakes a little at stop light and sometimes it doesn't. The CEL is not on. Checked plugs, wires, injectors and fuel pressure, fuel pump.
August 25, 2013.

Have you checked for vacuum leaks? Also, with that many miles on a 4 cylinder, you may want to check compression. You may have weak compression in a cylinder or two.