car seems to overheat when temperature gauge halfway

1998 OLDSMOBILE INTRIGUE
223,000 MILES • 3.8L • 6 CYL • FWD • AUTOMATIC
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CASPAR5555
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car runs fine when just started until the temperature gauge gets close to half way it starts choking and idling funny. Will chug and stutter a bit.. if I throw on a heater then it will bring the temp down and seemed to correct it but now that its getting warmer it takes last time until that gauge gets halfway,, I change the coolant temperature sensor thinking it might be that but that did not work so I'm not sure what's causing it
Apr 2, 2015 at 9:42 PM
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HMAC300
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scan for codes and check fuel pressure with a gauge first then clean throttle plate and iac hole with choke cleaner
Apr 3, 2015 at 7:43 AM