I question if the fuel pump is a concern because it runs good other than that speed. As far as the coild, does your truck have one for each cylender? IF so, I have had similar problems with the actual boot that goes over the spark plug. THey actually arc through them causing spark to short to the engine and some still make it to the plug so you get a mild miss. Have you checked them? If that is the problem, you will see a light gray mark on the boot where it arcs.
If you want to check fuel puressure, here is a how to:
You will need a gauge to check it. Most parts stores will lend or rent the gauge.
Let me know what you find.
Monday, November 2nd, 2009 AT 7:50 PM