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· Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
17,617 Posts
The occasional 'thump' at idle in gear might be the A/C compressor kicking on? Does it happen with the A/C off?
With a helper holding the brake, see if you can locate the thump under the hood.
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