1999 1500

[chief]

When was the last time plugs and wires were changed?

Run a diagnostic on the FI.

http://www.vulcandrifterriders.com/ECUFaultCodes.html
I assume this has happened after multiple fuel refills and the fuel is okay. Might want to add some seafoam or similar anyway.

[frankhenn]

 at 60 m.p.h. or above this drifter cuts out for a half second, sometimes no issue other times less than 60 m.p.h.

seems to loose spark or fuel blockage,  when not cutting out it smoothly will cruise at 85 mph ,will stop get gas and the cut outs will come back at app.60 so i babby it home at 50 m.p.h.   any thoughts? thanks  frank