Just got a Civic 98 LX M/T. It starts fine and runs fine, but then, after some time driving, it starts to throb, and when pushing the clutch, for stopping in a cross or something, the revs will drop until the engine stalls. I can start the engine easily after it, and it will run idle fine, until it happens again.
Already changed the IACV, but it doesn't changed nothing. Tested the alternator and it seems to run fine.
Something curious: At times, if the revs drops and the car doesn't stall, the check engine light will turn on, and the revs dropping seems to stop (but the idle revs keep at 500-600, and the normal is 700-800).
I don't know what to look after for solving this.