I have a '95 Sonoma 2.2L 5spd, A/C, The coolant temp gauge is reading very low. I have replaced the 'stat 3 times, cleaned the sensor and still no change. The heater blows hot, so I question the accuracy of what I read on the Gauge. Can a sensor not operate correctly and give a false "cold" reading to the ECM?It does not run well except at high rpms. Frequent hesitating and bucking. Downshift and get on the gas and it is fine. Any suggestions??? BTW, the fan clutch is fine.