 2003 Ranger 3.0 Engine Missfire
I have a 2003 Ranger Edge 2 wd with the 3.0 engine, 5 spd trans., and 4:10 axle. About 70K on the odometer right now. When accelerating over 3000 RPM the engine will missfire just like turning the key off for a few seconds. Keep it under 3000 and there is never a hint of a problem. The check engine light is not on. I have replaced spark plugs and wires. I had a mechanic friend look at it and he said it was indicating missfires on the left bank of cylinders, nothing on the right. He suggested to pull the exhaust and see if there was something plugged on the left bank. This did not change the problem. It does not seem to make a difference if the engine is under a load or not. I drive 150 miles each day and as long as I do not push the RPM it runs like a new one. Not sure where to go from here; fuel pressure, coil pack, ???? | 
