Guys iv recently serviced the scoob its a 03 wrx, i drove 180 miles no problem then all of a sudden i only have to touch the accelerater and the dump valve goes off, very very easily as normally id have to put my foot down to hear it!

Also its hesitating quite badly, so i got home put my normal dv back on and its still hesitating!

i have no idea as i drove so long after servicing the car before this issue started!

I changed plugs, air filter, oil n filter, fuel filter, cambelt, tensioners and waterpump

if it was timing surely it would happen before 180 miles???

 

One more thing it ticks over perfect

 

Is the vacuum line going to the top of the DV OK or does it have a split perhaps?