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One part which can do that is a bad crankshaft sensor. This sensor reads the rpm and gives you the fuel to make the rpm. If it is not reading all of the rpm, fuel delivery will fall short.
The rpm gauge would not be sending a signal to the ECM as it only reads the rpm's. The sensor that reads the rpms and from that information the ECM makes the necessary adjustments to the engine management. Have the fault codes read and look for a faulty cam/crank sensor.
there is fuel system cut off. the ECM think that the rpm is higher than what it should be, have a scan data read to see if ECM read different rpm of rpm gauge. rpm reading come from ignition module and crank sensor
You may have a slipping torque converter clutch or worn bands. Contact a local transmission repair shop for further diagnoisis. The turbine speed sensors measure in and out speed of the main shaft, if a excess differance is seen then it will turn on the light and set the appropriate fault codes.
are you reading your rpms right....5-6000 rpms should equal 70- 85 mph....that is certainly not idle speed....invest 20bucks in a Haynes manual----it is good reading
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