I would start by checking your steering box. I had one crack and it exhibited the same symptoms. If it checks our then yes I would check tie rods next.
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Ian Lomax - Current: 1973 Berlina, 1987 Milano Platinum "racecar"
Past: 71, 74 Spiders, 2x 74 Berlina, 74 GTV, 76 Alfetta GT, 88 Milano 3.0, 164LS