Chasing a vacuum leak

[Skoobie]

Well I got it all back together and took it for a spin and I still think theres a vacuum leak. I can hear a sucking sound in 4th at midrange rpms that get louder as I accelerate. Also the idle has trouble settling down and I seem to be sans some power. I just replaced a broken upper intake bolt and the upper intake gasket. Im pretty sure I got all the connections back on correctly. You cant hear any sort of leak at idle. So is there an easy way to test the system for a leak or do I need to start replacing all the hoses?

 

[HISSIN50]

a vac gauge helps. stockish motor should pull 15-20" at idle (i pull 19.5). i think you are on the right track - a vac leak will make the idle hang (and slow the return from higher revs).

a vac leak can be heard upon heavy deceleration while in gear - manifold vac can go over 20".

some use the old WD-40 around vac lines trick - if the idle changes, there is a leak where you sprayed. be careful of possible fire hazzards while doing such testing (many products are flammable).

good luck.