Q: engine speed not more than 3500 rpm

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No fault code only engine speed not more than 3500 rpm

My car has 185000 miles.
My car has an automatic transmission.

Usually when the engine experiences this condition, the issue is related to the [camshaft]https://www.yourmechanic.com/services/camshaft-position-sensor-replacement) or crankshaft position sensor. These sensors monitor the position of the crankshaft and camshaft in order to determine correct fuel and air ratios. If one of these sensors are malfunctioning, the result is that the engine will not exceed a certain RPM. I would recommend having your engine inspected for issues related to these two sensors. Consider YourMechanic for this inspection as a certified technician can come to your home or office to inspect your vehicle for you.

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