I have a problem getting my throttle or butterflies to close fully when I slowly release the gas pedal. The butterflies will stick slightly open. But, if I rev the engine up real quick and just let off the gas pedal, they will close. Watching the linkage, it appears like the throttle spring is too weak to close the butterflies fully when letting off the gas pedal slowly. Can I just replace this spring or is the problem something else entirely? If the former,, where can I get a new spring? I have searched and had no luck. Any help is greatly appreciated!!!

dont know if you can take it apart (rivet)?

but you can always install a return spring. like on a carb.

also make sure it's not all nasty in back of the plates..(clean it up)
should close when clean..

I repaired my sticking throttle body blades by removing the tb and cleaning the bores with some good carburetor cleaner and then hold the tb blades open and lightly sand the bores with some 400 grit sand paper until the blades no longer bind. worked wonders on mine. its been several years since I have done it and it still works like new

I did this:

Take TB off
Take butterfly plates off / out ( I believe they're are 2 screws each?)
They should slide out of the bar they're in
Take some green scotch brite and run around the OD of each plate lightly but enought to clean them off and take off any burrs / scratches
Clean the SH*T out of the innner bores, again running a little green scotch brite around the bores of the TB
Reassembled but only thread the butterfly plate bolts in halfway
Close the throttle body and they plates should center themselves in the bores and in the bar
Tighten bolts

The fact that it closes when you hit it hard means there is nothing wrong with the spring tension.The problem is with the TB binding up somewhere
Check the butterfly shaft for slop on the hole where it goes through the TB housing also.
When it wears out of round with age ( common ) the vac pulls the butterflies off center so they bind up on the bore and not close fully back on the stop
If any noticible slop then you can get TB housing rebushed

I'm betting it's the play in the butterfly shaft.
I just swapped in one from a doner car because mine had so much play.
I notice the most play in mine when I pushed the drivers side of the shaft towards the front of the car.
My idle is much more reliable now. sometimes it would idle at ~800 other times at 1500 with the original TB. A blip of the throttle and who knows where it would be.

Tony

p.s. I've never seen anyone sell a TB rebuild kit but there are a few guys that will rebuild it for you out there on the web, but you have to send it to them... (if anyone know different, I'd love to be able to go back to my original TB, it looks better )

The housing requires boring oversize so new shaft bushes can be fitted.
Some places will bore the TB out at the same time
http://cgi.ebay.com/ebaymotors/54mm-...Q5fAccessories
You send your old TB back for the core credit after you install rebuilt one;
no down time

Had this problem after I removed and cleaned my TB. A good couple shots of WD40 on the pivot shaft where it connects to the sides of the body fixed me right up.

Just wondering, how many miles are on your car? Maybe i should pull mine off and clean the crap out of it as some preventative maintenance.

If you don't know when it was last cleaned ; well worth the effort. Normally lottsa gunk in there

Reset IAC and TPS when finished
http://www.corvetteactioncenter.com/...and+Idle+Speed

greese the tb spring up and check for exhust leaks! ive got an adjustable borla exhust and with the smallest holed plate in my throttle wouldnt close! must be something to do with vacum. i changed the plate and its never happened since.

The spring is not the problem; it closes correctly if he snaps it shut fast.It is only on slow closing it binds up

Too much backpressure ; exh can't get out

Glad to see it all worked out at least, I will keep it in mind if I have any sticking issues in the future.... Thanks much