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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,913 Posts
The typical injector failure will make it run rich and you may see large drops falling onto the throttle blade as it idles. The throttle position sensor can also fail without leaving behind a code. A leaky EGR (if equipped), can also make for a rough idle quality.
 

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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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23,913 Posts
Does this seem to happen warm or cold or does it make no difference? If the idle fluctuation and stall happened within the first minute or two after a cold start, the O2 sensor would not be active yet.
 
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