Can anyone help!! I have bought a 110 1988 defender 2.5 di for £350 of gumtree , picked it up from Margate , and drove it back to bourn Cambridge , she blue out white smoke when she started and runs lumpy for the first 2minits but then cleared , when I got here home I thought the engine was...

Trying to fined out how this works , dose any one know i think it runs of gas , this was a army landrover 1986 110 defender ffr ht , i think it was used in cold wether