just messing around trying to figure out why im having all these stumbling problems and i stuck the vac gauge on my itbs ...

not sure why but with all 4 teed into my vac canister i get about -17hg at idle ,now as far as itbs go this is very good ...but when i disonected 2 out of 4 (1 and 4 is teed and 2and 3 are teed )i got -20hg....connect all 4 again and back to -17.

could it be that in between pules that 1 and 4 since there on the same geometry insie the motor be pulling vac from 2 and 3 in between pulses .