[Sidewinder1970]

Could be a vacuum leak around the seal of your engine cover. Put a new one in or torque the bolts down. Could be a vacuum leak at the PVC on top of your engine cover. Put a new diafram in en put some sealing around this diaframe cover. Could be a leak in your hose from your pvc to your airintake hose. Place a new one. Could be a vacuum leak at your oil return hose From the underside of your airintake to your engine. Could by a faulty vacuum hose From your turbo to the engine cover.