What's causing 25 amp start fuse interior in location 19 to blow on 2001 ford ranger?

I just change the timing chains on my 2001 ford ranger 4 door, 4x4, 4.0 L., automatic Trans. Truck ran great for a week. I ran to down yo corner and back pulled in drive the truck was idling below 500 rpm I held throttle open to 3000 rpms for 30 seconds let it idle back down it idled below 500 rpms ran rough then died I restarted then ran back up to 3000 rpm trying to blow the carbon out of the throttle body. Truck died again tried to restart truck doesn't turn over and the blows the 25 amp fuse in location 19 with the key in ignition and turn to the run position. Blows soon as your turn key to run before you start cranking.

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