The GTE and GE use different tachometer drive circuits. You can convert from one to the other by replacing a few resistors on the PCB or just locate a GTE tach and swap it in. I've post the details on the modification here in the past, some searching should bring it up... it *might* be in the MKIII FAQ section.
Also of note is that you cannot properly set the ignition advance if there are any diagnostic codes present. Clear the codes, set the timing and then see if the hesitation/break-up is gone.
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