My 1998 Honda Civic DX’s RPMs are fluctuating during idle. I start the car and it is normal for about two seconds. I am assuming around 800 rpms (I don’t have a tachometer). Then it jumps drastically higher, then lower, then higher, etc. Earlier tonight I replaced the throttle body gasket, rep…

RPMs Fluctuate at Idle

VDCdriver February 11, 2011, 1:59pm 4

If no vacuum leak is found, then my next suspect would be the Idle Air Control (IAC).