1999 Honda Accord Engine loose idle at stop or slowing movi

It is a Honda certified car when we bought at 55000miles, The idle issue happened right after we bought the car, however, it is not as worth as at 72000 miles.

5 minutes warm up in the morning start, at idle, rev up to 3000rpm, let the gas pedal go, the engine will loose idel immeidately.

Engine simply die at every stop, poor idle during slow traffic.

I have changed spark plugs just few days ago. No help