idle dropping and bouncing while stoping

[PiercedLip81]

besides the last few posts, the others seem to be from awhile ago, hopefully they have a solution?

Mine does it where if im driving and stop the rpms wanna go down a little and it feels like its gonna stall out. If I put it in N it goes back to the normal idle rpms. Sometimes if I put it in reverse and have the break held in it feels bogged down too. Only happens every so often...I have everything i know of up to par on maintenance...

[DhN]

someone help out..i have that same bouncing idle problem when i put it in park

[TheTempest]

lol. How ironic, my car started that tonight Mine isn't sooooo bad. It's from 900rpm -> 500 =( However, mine only does it when the radiator fans are running. Same thing with you guys?

[kurtis93]

i wish someone knew. i am still getting the idle fluctuation when i put the car in park, only does it once or twice but its wierd, and also, when i rev the engine and then the revs come back down they fall to about 1,000 then jump to 1,500 for a little and settles down to 800. really confused about that! any help would be great.

[blazen_accord]

It been a while, my car has not done it the idle bouncing much anymore, all I did was finding a good idle rpm spot at around 780rpm. any higher or lower will make the bouncing return. I also notice wehn it bounce at park, if I hold the gas down for 5-10sec at 2000-2500rpm the problem go away. must be some idle valve but it only happen every full moon so no big deal I still have the idle droping when when crusing and leting go of the gas or coming to a stop with my brake, if my rpm get down to 1600rpm it no gas petal is not depress it will dip down to 800rpm and come backup it does it only once before I get to a complete stop or slowing down. it does not bounce, but quick dip so that issue is still unsolved. hmm i am worry about my tranny, if I manually shift my LSD h22a tranny past redline say ~7500rpm from 1st to 2nd my car would jerk a bit and my tire would chip, hmm I did buy that uarthene(SP) front motor mount insert(stuck it in with a new front engine mountI replace), but with my megan header it does get hot under the hood. Oh any for people with auto tranny the rear motor mount has a vaccum line coming out, IT was never hook up when I did my h22 swap will that be a problem?

[JaK FRoSTWhiTE]

My idle doesnt "Bounce" like some people say.
But in the morning when i let the car warm up and then
start i notice that i got very low Idle.
If i come to a stop i notice my Idle drops to like 100-200. (Pretty LOw)

But yeah, im thinking that i may need a new Fuel Filter and Pressure Reg.

Now lets say i been driving normal and the car is fully warmed up
and i come to a stop, i see that my Idle drops low to like 300rpm.
Then it goes back to normal.

For that i think i got a Vaccum leak at the Brake Booster.

I will test it out and let you know the results i get.

[excalibur02]

this is really weird. i did my coco's h22 auto swap and it idles to with his stock p13 auto. so i put my 5spd on and it stopped... all his vacuum lines are perfect. and it was really weird to see that its his ecu. but after several months it stopped. but only comes back every so often. it usually bounced for 500rpm in park or neutral...

whatever.
maury

[Phempa]

replaced my Fast Idle Valve, and it fixed it on my H22.... if not a vacuum leak, then check out the FIV