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2005 grand prix help engine problems

T

traveus

New member
when i cold start my car it'll run fine until it gets hot then it runs rough nd the trans will start shifting hard. i have a check engine light on for gas cap and thermostat. it also only gets hot when I'm driving it. it'll cool down when parked with ac on. the broken thermostat usually kept the car cooled down cause its stuck open but now that its summer time and its like 90 out its not helping. hottest it ever got was bout to 2 lines from the red lines nd it was acting like it wanted to die. fluids are all full. no oil in the coolant. just got to 170k
 


it don't run fine at normal temp tho. the broken thermostat kept it at half the normal temp and that was fine until it got hot out. I'm going to replace it just haven't really had time and wanted to figure out whats going on with my car.
 
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