[Richard Coutts-Smith]

Hi Tony,
The only time we had a Jeep with similar problems it was a lack of fuel to the carby under load. Maybe worth checking filter and lines etc.
Some of the guys here use a bit of diesal in the fuel as they believe it helps prevent valve wear. Certainly never seen it cause any problems.
Personally I use a Moreys product in my toys, and whenever (finacially) possible I use the mid range octane fuel, and have no intention of going down the ethanol path. (Although I did use it for years on my EL Ford).
Have fun.......
Rich.