when i leave my car to idle it jumps around all over the map rpm wise. it goes anywhere from 1300rpm down all the way to 400rpm. also when i put in the clutch from anywhere above 3000rpm and let it go down to idle, it often stalls on me.

is this my fuel injectors? spark plugs? vacuum leak?

thanks a lot guys!

 

iacv would be my first guess.

 

Check all vacuum lines also, besides the IACV.
Your stalling issue could just be that you need a tune up, my engine use to stall when I would push down on the brake, and had a bad IACV.

 

it is very possible that the problem is a vacuum leak, although something i've noticed over the years with different cars is that vacuum leaks have caused higher idling that 1300rpms. the vacuum leaks i've encountered have caused an idle of about 2k rpms.

just something i've noticed.



i second the tune up or at least check the dist cap and o ring for damage.