I have a '92 Black MTX ... recently had my ignition key break off
The new key lock cylinder cost me less than $20 at Auto Zone (the stock one with the ligh is closer to thirty or so ... this will take care of the worn cylinder problem
Bryan,
I have a '92 MTX and have experienced some of the same issues only mine is an everyday car and the only time I can get it to do this is if the fuel down around 1/4 tank ... makes me think of possibly a fuel vapor lock ... will post more when I can get it in for a more thorogh check