where would be a good place to do a vacuum test??? plz picks if possible... if not plz explain as if ur talkin to someone that dont know much cause im kinda new to this....but my prob is my gauge is only reading like 17-19... when i start it i shoots to 20-24... i did a vac test and when its at idle its at about 22-24 when i get on it, it will shot up to around 30 but when i let off it goes down to about 15-17 is this normal????

 

bump

 

the stock gauge has been know to be inaccurate, best to use a mechanical gauge