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Injectors are due for rebuilding at 100k easily. If the car was driven rarely, deposits can form and cause issues with the spray pattern. The injectors need a cleaning at best, and a rebuild at worst. People see vast improvements with their engines because at 200k+ miles the injectors are toast.
Smoke when the engine's cold is one thing, but smoke at idle with a fully warmed up engine eliminates the glow system as a culprit and leaves only a few possibilities.
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