Sputtering sounds thru exhaust at idle..........
 

1994 Disco 1, 3.8 V8, 5 sp. Manual. High mileage vehicle. (173,000) Engine starts up from cold great, idles at about 750rpm. Has plenty of power, engine smooth, .....but after engine warms up when coming to a stop sign, and engine drops down to idle..now about 1000 rpm (clutch pushed in, foot brake applied) it will start to produce stuttering sounds (a kind of a rattling) thru exhaust. When I start to accellerate after a second or two the stuttering will stop. I am running premium with a can of seafoam added to gas. I have changed plugs and wires, new air filter, cleaned throttle plate (Butterfly area)..made sure all vacuum connections are secure. I am really at a loss as to what to do. Please note, this is a sound that comes "only" from exhaust, the engine does not have any mechanical sounds at all other than the whirring of normal operation...no ticking or anything.

RE: Sputtering sounds thru exhaust at idle..........
 

After you drive it and the exhaust is hot park it, crawl underneath with a hammer and GENTLY tap on the catalitic converters, if they rattle it means that you need new cats because the baffles are falling apart. It's common so dont worry.