Well this problem just came out of no where, around 10 vac my car studders like ----, i was running 5psi fine before, im thinking my vacuum lines are collapsing under vacuum because they feel very soft, i used some clear hose crap from lowes, do you think that may be the problem? the car has stalled on me 3 times also

 

it very possibly could be. you could do a pressure test on the lines to see if they are with a vacuum pressure tester..

does your car build boost at all? maybe a coupler is loose or a hole somewhere in the charge pipes..

 

is it a shudder like a miss?