Please diagnose this problem

[PukkaSilvia]

what turbo is it? new or new to you?

I would say you have an air leak somewhere.

I would also say that it is normal to have a slight difference in vac with different turbos but You may also get issues with cold idle if you have an exhaust blow so have you seated everything well?


but on the other hand you could of knocked something electrical while you were working on the car, check everything,electrical connectors on the air flow meter,ht leads,dizzy cap wires etc