Hi all recently bought a 1998 subaru impreza STI and its running like **** .. when idling it has a slight misfire ...

When driving and try to put your foot down the car hesitates like mad (feels like its starving for fuel) ...

I have fitted new plugs .. checked HT leads .. cleaned boost solenoid .. checked turbo actuator .. checked for splits / cracks in the piping ..

Don't know what else to check .. been told could need uprated fuel pump fitting ?? or could be to do with the baileys dump valves ??

Any ideas / help would be appreciated ??

 

is it running standard air box and exhaust....?

 

take DV off and blank off the pipes,see if it's better,

 

It has a hks super flow mushroom and ninja II exhaust system

 

Not wise to run on anything non std unless mapped to allow it.... could be a faulty maf though mate.

 

Will a 99 WRX Type Ra import maf sensor be the same as I could switch mine with my mates ??

 

I think it's different.

 

Completely different the 97/98 cars have the orange label maf

 

maf, dirty boost solenoid, worn plugs or wrong gap. vacuum leak. check these 1st. dont worry about the airfilter and exhaust for time being. also check the timing and there is a actual spark from the ht leads
sorry just read through your post again and realised you already done most.

 

Changed plugs, all leads have spark, cleaned boost solenoid yesterday .. I'm thinking it could need a uprated fuel pump fitting .. But will change maf before fitting new pump

 

Why not get it checked somewhere where the definitive problem can be pinpointed and addressed. It could be any one of a number of things.

 

not sure if your year works on ecuxplorer but i know it does on mine 99, worth a shot