boomnn

i have searched and couldnt find anything about my motor....i have a 2000 cx hatch w/d16y7 motor when i drive the idle is usually at about 800-900 rpms but sometimes randomly when i drive and stop it will go down to around a 100 and then sometimes stalls... here is where it gets weird if i turn my heater fan from low all the way to high and then back to low the rpms jump back up to normal until i touch the gass pedal then it goes back down to nothing and sometimes will stall....if i turn off the car then restart it it will initailly idle fine until i push on the gas at all... ihave changed the ignition to an msd setup but it was doin this before i did that.. is there something i can check for a vaccum leak or anything else i can check its driving me crazy..... i thought i would ask on here since so far any problem ive had someone has answered and helped me fix so tis forum is the best ive been on


thanks in advance neil.....