car revs to 4k rpm then back down after cleaning intake manifold

[90CB7EURO]

i clean my intake manifold put new gaskets and put everything back together then i go and start my car and it revs to 4k rpm then back down and up again,check everything but cant find nothing.I have no check engine light, i drove the car i runs ok,just the rpm's keep shooting up and down.when i disconnect the i.a.c valve rpms gow down to 3k then down and up,same thing but only up to 3k rpm.
i used carb cleaner and brake cleaner to clean the inside and also did the egr ports

[Gotz Cb7]

Gotta bleed the coolant system. Same thing happened to me.

[90CB7EURO]

gonna try that hope it works.i was about to take my intake manifold of and check evrything

['93CB7Ex]

You have a vacuum leak.

[90CB7EURO]

didnt help keeps doing.i let my foot of the gas completly to see if it will die but when the rpms get to 1k it goes up and car keeps going without my foot on the gas.im going to look for a vacuum leak somewhere

['93CB7Ex]

With the iac unplugged it should have smoothed out.

[90CB7EURO]

ok found a leak the intake manifold wasent tight enough, i blew some smoke inside the intake manifold and saw some coming out.now when i start it,it starts good then when it warms up to 1.k it starts jumping againg but only to 1k.then it stops but when i rev it it starts again.I tried smoking it out again but i can only smoke so fast.i was thinking maybe a smoke machine might do it.anyone have a better idea

[Monza]

If your looking for a vacuum leak you can use brake clean while its running and spray where you think it might be leaking, if the rpm goes up there's a leak

[90CB7EURO]

If your looking for a vacuum leak you can use brake clean while its running and spray where you think it might be leaking, if the rpm goes up there's a leak

thanks didint know that.im gonna try it

[90CB7EURO]

thanks it worked problem fixed