vacuum reading not steady

[SRT_DSTRHOLC]

When I replaced my PV with a 4.5 I was able to get the needle to stay inbetween 8-9 but not dead on one. What would casue this? I saw some where that maybe bad lifters or bad lobe?

 

[SRT_DSTRHOLC]

anyone? I also have a high stall converter

 

[idrift]

Bump>>>>

 

[SRT_DSTRHOLC]

thank u