Hi Scoobynet Members

This is my first post and im in need of some help if possible.

I own a My95 Wrx Estate which was running great until i had it Superchipped , de-catted both pipes and a Dumpvalve fitted.

The problem im having is at 4500 revs it holds back then suddenly surges forward, this is happening now and again, sometime it can go days b4 its back.

My Scooby is run at all times on Optimax and now Millers Octane Boost.

On a visit to Well Lane they bypassed the Knock Sensor and it seemed to improve so they told me to get the wiring checked from ecu to knock sensor failing that renew Sensor altogether.

Would anyone agree with this prognosis as any info would be much apprecited.

Cheers.