My MAC TB did the same thing and I found out that the part that turns the TPS sensor was too long and there was a vaccum leak at the tps sensor. After I tightened the TPS sensor down there was a gap between the TB and the TPS sensor. I fixed it by filing down the section that goes into the TPS sensor and havent had any other problems yet. Or you can block off the little hole in the throttle plate. Just kidding, but it was a temporrary fix untill I found out what the real problem with it was. 
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91 LX COUPE, 3.73 gears, 2 1/2 inch H-Pipe, 1 5/8 MAC long tube headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam,1.7 TFS Rockers, TFS Track Heat heads, TFS Track Heat intake, T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 190 GPH in tank fuel pump. And more to come.
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