Hallo Tom !
I have listed 2 Lars Tuntland:
1. Lars Christian Tuntland, b. 1844 at Tuntland, Hjelmeland. He left Norway i 1858 with parents Kristen Larson Tuntland, b. 1814 and wife Henrikke Tuntland, b. 1820, d. 1876.
Lars Christian m. Christina Christianson (1854-1952)
2. Lars Christian Tuntland !, b. 1848 at Tuntland
parents Erik Larson Tuntland, b. 1811 and wife Liva, b. 1825. Family left Stavanger, Norway in 1854. I dont know where they settled in US.
Perhaps one of those was your g. grandfather ?