Whuz up gang Trying to trouble shoot the shimmy in my 3-fitty My '91 Burbs' TBI 350 started running rough ( physically shaking ) at idle. It runs smooth under acceleration,but with noticable power loss ( of course it is stock and about to hit 200K mi ) and a slight hissing that I suspect may be the throttle body gasket. I put new plugs and wires in, and it improved some,but not enough. I just bought a new O2 censor thinking that might help,but haven't installed it yet. I'm thinking I could pull the plugs and check the gapping. what do you guys think any suggestions?