Thuding sound while coasting.......

thumpjimmy

Registered User
Please help w/ ideas!!!!!!!

I have a 90 sc auto(new to me) Car idles fine(a little rich) and while it has boost its ok, when I let off the gas and coast or hold a speed there is a thuding sound. I plan to replace plugs and wires this week and I checked and filled sc. Please help with with some things I can check or replace.
 
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