bad idle problem :(

[kswitch]

Im just wondering if anyone else has ever experinced this kind of idle problem. It basically is 3 things that are not normal with it
1. Driving in lets say 2nd i shift into neutral and idle will only lower to 1600rpm or so than when i come to about a dead stop it drops to 1k rpm.
2. First 3 gears seem to actually make rpms jump when clutch gets pushed in and this is with absolutley no throttle.
3. Last but not least is when i go to start my car idle goes up to 1700 than slowly drops to 0/stalls if no throttle is given.

Im just wonderin if this might be dirty tb or maf? Thx for your time u guys this problem has been with me since like 2 months after i bought the car but i can atleast say i killed a 01 prelude with 75 shot intake/exhaust

THx again you guys

 

[HISSIN50]

on foxes (not sure on yours), the VSS keeps the rolling idle ~1500 rpm so that the car does not stall. once stopped, the idle should go down to normal.

have you checked for a vac leak?

good luck.

 

[kswitch]

yeah i checked the vac guess its gotta be sumthin else :/ do you thing the clutch might be slipping if my idle jumps like that from just pushing it in? thx again for your help hissin

 

[trickstang94]

i had the same problem. sort of. When starting my 94 gt it rev high for a while then suddenly drop to 650-750. When driving and dropping into neutral it would do the same thing. I cleaned the MAF and all that crap and it didnt help until i replaced the idle air control valve. It fixed the problem. Maybe it will fix yours.

 

[RIO5.0]

i would check the TPS voltage and see where its at....if thats cool....I agree on the IAC, especially if its got high miles...
what appears to be a sticking throttle, is usually within those 2 items..

try unpluging the IAC and see if the problem goes away...have you messed with anything around the TB, such as the idle screws??? or did it just show up???

 

[OrangeMustangGt]

yeah my car did that when it was stock ,and now does it worse, do you have a cold air intake on there? i really wish i could find out what my problem is, im going to replace my IAC and my Temo sensor soon see if it makes it mint.

 

[kswitch]

ill have to check that havent had the time but yeah im basically stock only time i have messed with tb or maf was to remove it to put the el shortys on. I also talked to a mechanic where i work he said its probably that. Thx for ur help u guys least i know now this isnt tranny/clutch related