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1.loud grinding,vibrating noise under tranny tunnel 2.tapping noise from engine on 1995 Isuzu Pickup

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
I hear a loud vibrating noise from tranny tunnel, mainly when RPM's are a little high and I let off gas pedal. If I engage clutch or step on gas pedal it goes away. have new muffler and pipes. heard it could be cat. converter has gone to pieces. 2. noise is a tapping or ticking noise constant from engine. I assume a flat spot on lifter or valves need to be adjusted.
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