[john70t]

My apologies. I misread the original post. I thought the problem was idle misfire.

Start with fresh fuel obviously.

There may be shyte in the fuel tank blocking the fuel tank screen occasionally.
Full tank vs. 1/4 tank will make this more obvious.

The fuel pump itself might be weak.
Or it might be getting weak voltage.

Total power failure would indicate total system failure..ie...not some single injector but the entire delivery system.

Change the fuel filter.
Change it again.
Make sure the battery and alternator is supplying the 13-14V juice at the FP connector.
Then go from there.