codes

I'm having a problem with my 94' regal cutom 3.8....It stalls while running and sometimes starts right up...sometimes not...The tranny sometimes skips first and starts off in secong...sometimes not...overdrive lets the revs drop to idle when you release the gas and there is no braking effect on the engine in OD...I got htese codes...
123 TPS
321 No 18X ignition pulse\
630 battery volts
703 brake switch
755 tranny solenoid B
361 EST line not toggling
705 Park/nuetral switch failure
406 EGR not positioning
300 misfire

The car runs good...I just don't know where to start...The voltage is good and the amps are good from the alternator...Please help...confused

Best thing to do is clear the codes and start fro scratch and see what comes back.

The TPS code and ignition would be my main focus as this 2 things can cause all your problems.

I check ed the TPS with a new one and it seems fine..it has the right input voltage, output voltage, with no blank spots...I'm not sure what "no 18x ignition pulse means" if you do please let me know...before I got these codes I cleared all previous codes...I changed plugs, air/fuel filters, trans filter/fluid, oil filter/fluid, and suspension components...I just can't understand this freakin auto...what a PITA...I'm guessing maybe it's the tranny module...ne1 have ideas?

The 18x is referring to the ignition module. You will have to have a lab scope to check the integrity of the circuit.