Car will idle then die

[blkgsx90]

My 1990 GSX will idle at about 1000 or so for about 15 minutes. Then when I am stopped it will start to jump around from the 500's to 1000's then stall if I don't give it some gas. Could this be from a vacuum leak or boost leak?

 

[ddavisaf]

Yes, it could be. Do a boost leak test. Fix any and all leaks you find. Then check your ISC and TPS after the boost leak test.

 

[shuiyuan]

i got this problem becasue some vaccum hose fallen off when i put back problem disappeared