I just got my 96 F150 running with a heads, cam, long tubes 351w swap in place of the 302. It is being ran by the original ecu and wiring harness that has been problem free for 350,000 miles. The fuse blew once idling in my driveway and on a short shake down ride tonight it blew 3 times and i had to coast down my street into my driveway lol. Any ideas?

Now not sure if this is related but all of the tab/tad/egr/differential feedback sensors are removed but the plugs are still on the harness. It has NEVER blown the pcm fuse before swapping motors.

 

Something is getting crossed up somewhere...(Obviously)...

 

Problem solved. Ended up being a bare o2 sensor wire shorting on the frame because of the headers.