Car issue

My car is bogging down it started last summer but stopped when winter time came around an ran perfect it only starts bogging down when the motor heats up we Bought new thermostat didn’t help then took thermostat out last year still didn’t fix problem now that warm weather is back my car has started bogging down again (only when motor gets warm tho) did it today wouldn’t go over 55mph for bogging out an trying to die but long as I stayed under that an didn’t accelerate hard it didn’t bog out got it home let it cool down an tried it again runs perfect until it gets hot again
 
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