Accelaration issues seemed to pull back can't work it out

As it says up there 1.8 know series when engine is hot the engine seemed to pull back only way to say it feels like it's running out of petrol have a couple of queries

Could it be a 4x4 Failure?

Could it be injector

Can't work it out even more frustratingly it was sitting for ages 3 plus months on a driveway and just fixed a big cooling issue

Is it coil packs or dizzy?

Could check its been sitting for months as the last owner couldnt afford it