Imchen was going to his constituency Koridanga in Mokokchung district from Kohima when Assam Rifles personnel conducting search of vehicles near Wokha district found the arms and ammunition, liquor and cash, the sources said.
The Assam Rifles personnel handed him over to the district administration and police.
Imchen is the Nagaland People's Front (NPF) candidate from Koridanga and is also the NPF campaign in-charge of Mokokchung district.
The NPF has put up 10-candidates in Mokokchung district.
On February 16, an Election Commission surveillance team had seized Rs one crore cash from a helicopter allegedly being used by a candidate of the Nagaland Peoples Front (NPF) in Nagaland.
A team of EC-appointed observers seized the cash from a chopper, which was allegedly hired to ferry Nyemli Phom, who is contesting the Assembly polls from a constituency in Longleng district.