where do the vacuum lines go from and to on a c4? i just relized that could be the problem why my car isn't moving when i put it in any gear.... it just jumps.. any help...

ourvacuum line runs from the brake booster to the modulator on the tranny

same here

the modulator is that brass thing with the adjust screw in it right?? so run a small hose from that to the booster and adapt to a hose that will fit the booster??

yea that should work, whats it doing not shifting?

fixed it thanx! and it was a 2 quarts low on tranny fluid