out of ideas

[nate_drake]

i know its my first post and its asking for help but im desperately trying to figure this out any help is greatly appreaciated....

car : 1989 180sx with s13 blacktop

ok here whats up. just getting my car going after the build.

here is whats wrong: starts well, idles, holds a vacuum of 35 or so cm/hg. has a high idle though. motor skips every second or so. after it runs for 5 mins or so its idle drops to like 500rpm and loses vacuum. stalls out. if i try giving it throttle it boggs like crazy, it back fires through exhaust. shakes like crazy. wide band reads 14s the whole time its doing this and the plugs come out BLACK. not wet from running rich or anything either. lots of carbon....

things ive done to try and fix this

new plugs gap to .028new fuel filterchecked my cam timing all is good. lines up everywhere inc cam pos sens.checked for boost / vac leaks with carb cleaner method.checked groundsdan came to put a base tune on the car for my setup.checked to see if i was getting spark on all cyl.checked compression 150 psi on all cyl

running a power fc with map sensor..

ill take some vids in a bit.

any help or advice would be greatly appreaciated

thanks!

nate

[nametakennow]

Moved to RWD SR.

[DuckyD]

Possible IACV issue?