im stuck wit this one, just wondered if any one had experienced this

My saff blows engine management relay fuses, mostly when under load (boost etc) the loom is brand new carloom loom so i dont think its that...

also, this has only just started t happen so not sure the 2 are connected, but when i try put it under load it hesitates and dies for a brief second, but if i just cruise its fine, im thinking possivley sensor, CPS and Phase are brand new, its also on coilpack.

any suggestions?

cheers