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Well there several things that can cause this. The first is an exhaust leak. Have your exhaust inspected. The second is engine misfire due to the timing being off. In turn could cause other problems. If you have a exhaust leak at the engine, you could of burnt a valve. You may have a worn out cam shaft or timing chain. It could be a collapsed lifter, bad valve spring. The first 2 things to check are the exhaust and the engine timing. You need a good mechanic that knows these chevys for your best fix.

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16y ago

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