Car is 93 del Sol with d15b7

For the last couple of months my car had idled really weird but now its very bad....it started off like this......

When starting up the car in the cold, it would usually rev up to about 1500
then after a min or two, it would drop down to 950 then troughout the day as long as motor was warm eveything idled fine....

Recently the car started to idle up to 1500 like normal but then it would drop to almot 0 then goess back up to 1500, it would do this for 5-10 mins and then would operate normally.

Now it does this all the time, no matter if the engine is hot or cold, it will rev up to 1500 then back down to 0, even after I have driven over 100 miles....please help

I tok off the IACV and cleaned it but still idles the same...when I take off the intake pipe, there is a loud sucking noise and when I put my finger over the hole close to the bottom of the TB it idles fine....does that mean my TPS is gone bad or is this some other part gone bad?