91 celica problems and issiues

[Gunja12]

Hey how are u guys have question I have 91 celica gts 2.2 with cold air intake on it my question is that I have had some issiues lately car starts fine high idle when cold almost 2000rpm for few sec than will drop to 1200 rmp after about 3 min car will stay at 1000rpm start driving the car after 5 min of drivin I start to get a noise out of my intake the little tiny hole on bottom think that's where my iac valve is but the strange part is that when drivin down the road in any gear put foot on clutch go to shift and u get noise out of same place as well drivin down road if I let the motor load up goin down a hill and shift into a lower gear instead of back presure sound getting noise out of same place I'm lost everything telling a faulty iac but can't understand noise o ya once this nois starts in the intake I get bad valve tap or spark nock but all new in that area this year can some one please help love the car

[Gunja12]

Well fix it was Iac making noise sensor was workin good but the guts to it where broke