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i have a 94 gtp with about 197000 miles on it the other day i hook up scanner and it had these codes 1640 quad driver " A" error, 705 PRNDL switch failure and 740 torque converter tcc failure what is the guad driver and what does it do? why I'm i getting the 705 prndl code car starts only in neutral and in park? and what up with the 740 code tcc failure? i have cleared the codes and the only code that keeps coming back is the 705 code why havent the other codes come back ? i was told that the quad driver is and output driver in the ecm and that i have a bad ecm and that it may causing the problems . does anyone now what the quad drive "A" controls since the scanner said that there was quad driver "A"error. and whould the tcc 740 code cause me to get bad gas mileage