1996 Chev S-10 Blazer Hesitating - Engine

Question: My 4.3L S-10 Blazer will hesitate and seem sluggish when driving in 100 dregree + abient temperatures. As I apply the accelerator the engine will gain revolutions and then drop them and come back up. My service engine light has been coming on at different times and then go off. the light does not coincide with the hesitation. A friend suggested the heat sensor, but the local Auto Zone does list a heat sensor for my blazer. Any suggestions would be appreciated. thanks

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Technican: I think your friend was probably referring to the coolant temperature sensor. We really need to know why the check engine light is turning on. When it turns on a trouble code is stored in your vehicle computer (which is actually a PCM or powertrain control module). It is generally expsensive to have a shop access trouble codes from the vehicle. A great service that many autoparts stores provide free of charge is pulling the codes. This includes Autozone. Please visit them and have the codes read. It's important that you come back with the actual code number(s). An example of a trouble code number is P0300. Autozones interpretation of the code will not be helpful (ie- they may say you need an oxygen sensor when I may have evidence to the contrary). Please let me know what trouble codes they find.

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