I have 1.8 vtect civic 2010. I bought it and i was told earlier it was running on cng but later cng was removed. When i bought it idle running was normal both with or without AC. I took it to honda 3s they serviced it and did throttle body cleaning since then rpm is not less than 1000 and fluctuate between 1100-1500. Honda mechanic tells me to change throttle bod any economical way of solving problem
Try changing one by one below two items :
TPS throttle position sensor
Idle air control valve
Problem is 100% lying within these two items .
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It is sometimes related to the battery as well!
Did you disconnect the battery ?