Pontiac Problems? Ask a Mechanic for Answers ASAP
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it sounds like the overheating has or may have damaged the head gaskets. there may be coolant getting into the cylinders giving you low power as water and gas do not mix in a cylinder.
the hose being rock hard is a good indicator of compression in the cooling system. you can get a chemical kit at a parts store to check for hydrocarbons in the coolant