Another Ford Story.
This Bronco would start, run poorly, and die if the accelerator was touched.
Another shop (no names, let's just say they do everything for less) put in; 2 fuel pumps, 1 distributor,1 engine coolant temp sensor, and g...od knows how many hours of diagnostic time. After all this they gave up an said they didn't know what was wrong.
The customer called me at 5:30am Sat morning (expecting a machine) and I told him to bring it over and I would look at it right away (on Sat). 45 minutes diag, found old ignition rotor had a hole burned down the center causing spark to divert to distributor shaft. $13.00 rotor and the truck runs great.
One more happy customer (happy with me at least).