my 2003 ranger 2.3 starts and idles fine but has a miss when under a load like pulling a hill. you can raise the hood and let it idle and start moving the throtle when it gets to about 2500 rpms it surges , if you hold the throtle all the way open it does it really bad. All I have done so far is changed the spark plugs and fuel filter.
2003 regular cab. 2 wheel drive 2.3 engine.