problem

[tru_40sx]

i have a problem that i never encounterd before,
my 93 240sx with a stock ka24de,runs rich(throws black smoke),idle is rough and idle sometimes stays at 2,000 then drops to normal idle a couple of seconds later! any help much appreciated!

[pignose4life]

how black is the smoke? like seafoaming?(http://youtube.com/watch?v=5vHFPxp_NqA)

[tru_40sx]

holy shit! lol naw not as bad as that! alil bit lighter.....

[NemeGuero]

vacuum leak

[tru_40sx]

ok will chek