hi all i'm new on here and new to impreza ownership and was wondering if anybody on here could help me out.the problem is when the car comes on boost it pulls really well but hesistates and goes really flat through the rev range.it doesn't feel like a misfire and does pull through it and get going towards the top of the rev range(5000-5500ish)this is annoying as its not logging any faults.i've changed the plugs for ngk 7b's and fitted a walbro 255 pump last night as i've heard these can be bad on boost,yet the problem still persists

any help would be great for my sanity

 

What year car?

 

sorry forgot to put it a 94' wrx

 

Sounds like it could be a boost leak,or poss coil packs. Check all hoses you can get your hands on,also check the electical connectors too. I had a bolt missing on the pipe that goes to the intercooler on my last scoob,gave the same problems you say.

Mit

 

just cleaned out maf wasn't really that bad but cleaned it anyway,car doesn't feel anywhere near as bad now still abit flat but better.will check cooler pipes tomorrow and have a general look round.is it poss for maf to play up but not log faults ??? thanks for your help so far mit