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Discussion Starter · #1 ·
my 99 merc is fine but the engine light seems to come on. when i rev it to 4 or 5 for a day or 2 the light come on and will somtmies go away a few days later or just shiftin at 3 but i took it to the shop and they said it might be a glithc in the thermostat but the next day i drove it it came back on. do u know wat it oculd be or how to fix it , i don t have much money so i need to do itm y self
 
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