Ok, I just got done replacing my rear end with a posi set of 3.27 gears, and then replacing my blown tranny with a 700R-4 out of a van and now.... my car idles at around 1,500 rpm. When I shift it into drive or reverse it stays at about 1000. Makes it kind of hard to stop at a stop sign in the snow when the rear tires keep pushing you forwards.... any ideas? I backed off the torx bolt by the throttle plate until the plate wouldn't go back any more... my manual says there is nothing I can do to adjust a fast idle....

 

EO,

Since you've moved the Torx(R) throttle stop screw, you'll now have to perform the minimum air adjustment from scratch.

The transmission from the van/truck likely has a higher stall speed torque converter. On of the tricks to performance is to install a higher stall converter, and remanufactured units from S-10 trucks are excellent candidates. Their stall speed is rated at 2,025 RPM. The van transmission may have a similar converter.

With a higher stall speed, the engine will be allowed to idle higher without causing the vehicle to creep in DRIVE.

Another possibility is that the transmission Throttle Valve (TV) cable is adjusted incorrectly, holding the throttle open slightly. Check the cable adjustment, then reset the throttle minimum air position using the manual transmission specification os 800 RPM in neutral. Once everything is reconnected, the idle speed is maintained by the ECM.

Another possible cause of high idle speed is a vacuum leak (more idle air). Check all hoses and connections for leaks, connections, splits, cracks, etc.



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Later,
Vader
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"No matter how hard you try you can't stop us now"
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check your throttle body to manifold seal

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91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 226/230 duration and .477/.480 lift. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, ****ty stock converter.
13.24@104