Car has no spark after running rough :S...

[JohnL]

Alright, fingers ****ing crossed it will be right after the new leads..

At least have your lead resistance checked. If they are within spec then no need to replace (leads ain't that cheap either).

im sick and tired of this car already and had it for 1 month

It sounds like the sort of trouble you get after buying a car that hasn't been maintained all that well.

you got any idea btw about the leaking air hissing sound from the engine bay (comin mainly from injectors)

It could be a gasket leak on the intake manifold or plenum, or leaking injector seals (sucking air). If so it certainly wouldn't be helping the smooth running of your engine...