Help Help Is it a vacum leak

[Bobbys14]

Just an update, martain tracey told me he would put it down to leaking compression on a valve or piston ring, with the engine only rebuilt i was hoping it wasn't and the only thing i tought it could be to do this is the vtc removed is messing with the timing on low rpm so i stuck it back in along with a set of rocker arm stoppers and so far so good vacuum is back good and idling nice at 800-900rpm..

Thanks for the suggestions ppl

Bobby

[Arnie]

Good man, I saw similar problem with s14 in KK, thought it was down to coilpacks (melted) but didn't realize timing can affect running so much.
On that car there was boost when engine was revved up, and huge amount of exhaust gas blowing on idle, just couldn't believe it. It was after h/g job so someone didn't put it back as it should be then.