vauxhall frontera problems

[gsxr1100tony]

can anyone help, i bought a long wheel based fronterier, you start the engine and within minutes it coughs and spluts and will not pull away. you turn off the engine and let it cool, i was told it was the catalytic convertor which i have replaced but still have the same problem, does anyone know if its the lamda sensor and is it hard to replace thanks tearing my hair out.

[Toureman]

Cat would not cause coughs.

It is no use replacing parts at random, could cost a fourtune, if you don't know about cars get it to a garage, cheaper in the long run.

[Big Bri]

it is the fuel pump relay located rear of n/s front head light black in colour . its not the lamba or the cat

[gsxr1100tony]

cheers toureman and big bri

good advise and fuel pump problem was a cosideration of mine however it turned out to be the air flow sensor located on the left hand side top of engine
thanks gsxr1100tony