can only help me ive got a 95 wrx ive just fitted another engine in it an its running sloppy ive checked an changed plugs an coil packs an checked the timing an they are all fine theres no engine check light on i was thinking low fuel pressure how can i solve it thanks

 

could a bad earth cause it

 

If you have replaced the engine with another Phase 1 engine, ie same turbo, same injectors, same phase, then you shouldnt have any real issues unless the engine was screwed, phase 1.5's are slightly different but should be compatable as long as you have the same turbo etc, phase 2's wont be a direct swap as they have bigger injectors etc which means you will need a mapped ecu to run them correctly.

Tony

 

the engine was out of a 97 i changed the wire loom an inlet manifold turbo was the same, its running but has a little misfire an im not getting full boost