what can cause my rpm's to drop at a stoplight?
while at a stop sign or stoplight my rpm's on my 2003 Nissan Sentra SER drop below 500rpm's. If i drive without the ac on it does not happen only when i have the ac on. What can be causing this?
The A.C. sensor is not working. The A.C. is putting a load on the engine and the rpm is dropping.
Idle speed control could have also failed, do you have a check engine light on?
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