Legacy bh5 ej20 non turbo revs power issuem

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Hi all,

Having major problems with my legacy. Car runs ok for a few days and then I start it up and it has no power under load and then increases around 2500 and then revs and gearbox step right up to 4000 and up.

If I hold throttle at 2000rpm its surging and retarding within 100rpm either side of the 2000rpm.

Temperature guage is fine

I have replaced new oem airflow meter (maf)
No codes are coming up when plugged into diagnostics

Its a gremlin thats driving me mad has anyone had this issue?
Thank you
 

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