what kind of car? I would say a head gasket leak would be where the coolant is going it is probably just slow enough that it is burning out the exhaust. as for the electrical my guess would be the alternator might have a regulator problem that hasn't become intermittent. if I had to guess I would say this is a 2.2 chevy motor?
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2000 SS Procharger
98 Z vert turbo
07 TB SS cai catback and tune
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