Pontiac Grand AM engine problems?


have 2001 pontiac grand 2.4 se1 dohc. car been misfiring underload when heater or ac on. car idles drops @ stop light go 600rpms 500rpms or below , car feels going cut off. after driving 20-30mins when i'm @ stop sign or light car temp go 200 230-240 when start moving light go down. car starts rough sometimes. took pep boys , did chemical test on , said fail. car don't smoke or leak coolant. there's no oil in coolant or coolant in oil. , oil not milky. sound head gasket issue you?

i have 2001 pontiac grand 2.4 se1 dohc. car been misfiring underload when heater or ac on. car idles drops @ stop light go 600rpms 500rpms or below , car feels going cut off. after driving 20-30mins when i'm @ stop sign or...


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