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I have a 1983 cadillac seville with the Ht-4100 i just got it it ran beautifully then it just started popping timing was off so i set it still backfire then i changed the fuel filter...then i checked the fuel pressure which was fine so it can’t be the fuel pump...What can it be?
 

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1984 Eldorado Biarritz
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Bad cam, check the oil for coolant. If no coolant you can still salvage the engine, take the drivers side valve cover off and see which valves aren't moving.
 
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