Vac problem

Back n black bird

Registered User
Ok, i'm sitting idling in traffic and the boost gauge sits at vac20, but if i turn on my air conditioning, it goes up to like 10 in the vac. is this normal? it also seems really sluggish when it does this, and idles rough and shakes a bit, also it does this sometimes in the hot weather without the air conditioning being on..any help is appreciated
 
re:

Just a guess. Motor mounts OK? I've heard worn mounts can cause a host of problems including what you have mentioned. Just a guess.
 
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