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Bad Cat... or? 200

posted by  cmho2 on  Mon Nov 10 04:11 CST 2003
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last visit: Sat Jul 20 21:51 CST 2013
[RELATED]

Recently had the manifold pipe replaced on my 84 244 (I bought it from FCPGroton - had local mechanic install). Since then there is now a loud rumble and vibration when I accelerate (3000 RPM+), which goes away as soon as the transmission shifts and the RPM's drop back down. The car feels less powerful than before also. Once I've accelerated hard a few times causing the noise and vibration (with warm engine), the car seems to have more power again in normal driving.

The mechanic mentioned having a tough time removing the cat-to-manifold bolts.
Could this be a clogged cat or maybe something entirely unrelated?
Any advice humbly appreciated!






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