well, i recently installed some vac. gauges in my truck, and after it's warmed up....at idle i only pull about 13inches of vac. well, my truck has a cam in it, but not sure on how mild/wild it actually is....my good friend(diesel mechanic) said it sounded pretty wild to him, but this truck idles fine and don'est jump around or anything.... what would cause such a low vac???? also, and probably more importantly, when i slowly increase throttle, the vac goes up to about 18inches or so, but when i punch it, it drops off fast, then goes up and finally settles at around 13inches or so....it doesn't fluctuate at all, so i don't think i have a vac. leak, not to mention all vac lines are brand new. here is how i have everything hooked up...anybody got any ideas???? the timing is set so that it doesn't knock/diesel/runbad at all.... but if i advance or retard the timing at all, the vacc. drops to like 8 or 9inches...even with just 2degrees advance/retard here's my drawing(not to scale) and no, im not an art major.