Is this your McIntyre?? John D. McIntyre born Will Co., Ill. March 27, 1844 son of Duncan and Lucinda Harsall McIntyre, Grandfather John McIntyre born Kenmore Scotland Aug 5, 1766, lived in Perth, wife Ann also born in Scotland (March 20, 1770-May 6, 1857), he died July 31, 1848. John and Ann had seven children one of whom was Duncan father of John D. listed above. Duncan had gone to Ill. but came back to Johnstown/Perth area in 1845.
John D. married Sarah Ferguson.
Reference: History of Fulton Co.(includes Mont. Co.) by Frothingham page 84. Have more if this is the connection.