ignition fuse on 92 Metro

My ignition fuse on my metro keeps blowing. It will only blow when I hit the gas after stopping. Also,the car has to be warmed up. I replaced the O2 sensor, but it still happens. If I let the engine cool for about 5-10 mins then I can put in a new fuse and it'll run for a while until I getted stopped at a light. Any thoughts?

Are you using a 20 Amp fuse in the underdash fuse box for the Ignition fuse? If so, are there any other accessory's such as aftermarket car stereo's etc wired into this circut?

yes it is a 20a

There was a random wire on the fuse (obviously not stock) but I have since taken it off.

I have found that the problem really only shows up if the veh is warmed up and it is idleing.