hey i have a problem with a 1998 honda Accord EX. the car is a 4clyn. automatic. The car when cold, the first start of the day, will start up and run smooth, then about 5 mins. into the idle when the car starts to warm up, the idel will bounch, about 600rpms and is very consistant. After it hits operating temperature the fluxuating idle probably bounches between 300rpms. From 800 to 1100, just consistantly bounching and doesn't stop. I have already replaced the spark plug wires, because they shocked me when I touched them. When you turn the car to the On position without starting, I noticed the Maintanence light will flash about 10 times and then turn off. Can anyone please help me with this problem. Thanks.

 

vacuum leak, probably a loose hose, or the hose can also have a crack/hole/opening in it.