I have an idle problem. What could it be?

I have a 1994 Honda Civic. After a cold start, probably after 40 seconds, the RPM gauge starts jumping up from 1000 rpms to 2300 rpms continuously. This happens while being parked and while driving.

Due to some research and advice from other whom have had the same issue, I've cleaned out the air idle control valve for any clogged up junk, the manifold too, looked for any vacuum leaks, and also checked the cooling system to see if there's any air in it. Nothing has changed really.

Today, I had the problem where I turned on the car but it turned off on in about 2 seconds. It will stay on if I step on the gas pedal right after I turn on the car. Also, before it gave me this issue, after every drive and while having on the heater, I always got this smell of gasoline. Does this have anything to do with my idle problem?

Let's keep in my mind that I am no mechanic. So any help or advice will be very well appreciated guys. Thanks!

Read more: I have an idle problem. What could it be?