I took off the TB yesterday to replace the t-stat and when I put it back on and cranked the car it would idle at 15-1600 rpm in park and about 1000 in drive. I checked all the linkage and it looks fine. I'm pretty sure that the blades are closing all the way. Whats goin on here?
bsa

------------------
"If they do not run, Then they will die." - Stonewall Jackson

'87 IROC, 355 TPI,700R4, Trick Flow Heads, Comp Cam, Comp 1.6 Rockers, Lucas 23# injectors, Edelbrock headers, Flowmaster 3'' exhaust, gutted cat, Mallory coil, Mallory HyFire IV ignition box, Mallory Sidewinder 8mm wires, Autolite platinum plugs, K&N filters, Transgo Performance Shift Kit, Corvette Servo, 2,000 Torque Converter

 

IROC,

If this is happening when the engine is cold, it can be normal. If the idle is that high on a warm engine, I'm guessing you have a vacuum leak or the IAC is sticking open.

Double check the gasket positioning, IAC connector, TPS connector, and vacuum line under the TB (to the EGR solenoid/EVAP canister).

Remove the TV cable if you have an automatic, and remove the cruise cable if equipped. Either one of these could be holdng the throttle open a bit.

------------------
Later,
Vader
------------------
"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

Had that same problem a few yrs ago, when I put a spacer on the tbi unit. I tore the gasket, once I replaced it no more high idle. it's simple, and cheap to check.