Cutting off going down the road

[fun in dirt]

My daily driver acts like it has a gremlin, please help!
2007 classic (cateye), 1/2 ton plain work truck, 4.3 V6.
206k miles & has been a great DD, but about a month ago it started just cutting off while I was going steady 60mph down the road. I felt a miss/ jerk several miles before for only a second & then ran smooth as silk again then it just cut off ... no check engine lights on or anything. Threw in N & coasted to the side. It would spin over & then after a few tries, crank back up & be perfect like nothing happened... maybe for even a week or so, then happen again.
Because of the initial jerking, I thought maybe fuel pump, but checked pressure & all that perfect. A co-worker said he had one acting similar & was the crank position sensor, since it was only $30 & 15 minutes, replaced that but did it again 2 days later. Last weekend replaced air filter (couldn't see the sun through it) & ignition relay (grabbing at straws), drove it Monday - Thursday (about 40 mile commute each day) with zero issues & was excited. Only for Friday afternoon going home to do it again - jerked once after about 10 miles from work, then cut off after about another 8 miles. Spin, spin & not crank (like no fire) then after sitting about 5-10 minutes it cranked like nothing wrong & made it home running smooth, no CEL or issues.
What else should I look for... any ideas?

[hatzie]

Look at some crank no start checklists and start testing.

Intermittents are miserable to find.

[LDO]

Originally Posted by hatzie

Look at some crank no start checklists and start testing.

Intermittents are miserable to find.

Hatzie, sent you a PM.

[fun in dirt]

Update - I guess I found the issue, it's been about 3.5 months & still running with no problems (knock on wood).
Cleaned both ground location on block, at front on passenger side & on rear of drivers side - they were both pretty funky. Also cut some length off & put new ring terminal on ground wire from ign coil that was connected at front passenger block location - it was green corroded a few inches up the wire... that was probably the specific issue.