My 87 300E wouldn't start this afternoon, it ran fine yesterday. Checked all fuses as that was what happened to my SL a few weeks back. Car wouldn't start in Park, but cranked right up in Neutral. Took it out to have a hair cut and got some gas, now the car starts in Park again, what may be the cause? Should I be concerned?

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95 R129
04 Infiniti G35.5 BS
10 X204