Tried new plugs, oil change and new catalytic converter

1992 CHEVROLET SUBURBAN
177,000 MILES
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SUTHERS89
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I replace my catalytic converter on my 1992 chevrolet suburban 2500 V8. However I still have a terrible shaking upon acceleration. I also hear a sound that sounds like a exaust leak but I cannot find it. What could be the problem
Oct 17, 2011 at 8:47 PM
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JDL
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New plugs is only part of a tune-up. How long since overall tune-up? Any applicable trouble codes? Use a gauge and check fuel pressure. What about motor mounts and suspension/steering?
Oct 17, 2011 at 8:59 PM
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SUTHERS89
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It has been a while since a full tune up. Motor mounts are good steering is good.
Oct 17, 2011 at 9:03 PM
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JDL
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Any applicable trouble codes? You should be able to check those, yourself. Some of the national brand autostores used to loan out a fuel pressure. You may to put up a depost for the gage, but, you get it back when the gage is returned.
Oct 17, 2011 at 10:47 PM