Well, I don't have that car, but I can offer a little advice, and hopefully that will cause some one else to chime in, especially if I am wrong!!

First you need to determine if the problem is with the cable from the pedal, or with the butterfly itself (throttle plate). These 2 are seperate systems so you should be able to seperate them and make that determination.

If it is the throttle plate, then you need to do a close visual inspection with a flashlight to see what might be blocking its movement. Could be something fell into one of the orifices when you had some hoses disconnected? Or maybe just a lot of gunk built up in the throttle body?

You mentioned it opens 1/4? Is it free up to that point? If so when it hits the end I imagine it would make some sound that would come from the problem area.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra