TNight

Sorry Bros I have posted this a couple times over the past year w/o truly having time to attempt the fix and the days I figure I will work on it ,it starts right up ,Like today for instance. The car has been sitting for about a week I went to start it and of course it started but this time it was real slow to get up to idle then I got an engine light and it was surging like when you have a bad AIC I think thats what its called Anyway I checked the computer Random Misfire .Shut it off cleared the code held the throttle open to 3000 rpm for about 40 sec hi Idle shut off and it ran fine and quite and right drove it for about an hour w/o issue. So the battery sits at 12.4 volts and drops into the 10.4s when trying to crank but on days when it won't start sounds like it is cranking slow . I am getting Spark, I have fuel and I have good fuel as I got gas 1/2 tank about 2 weeks ago Fuse 15 is good tested and replaced just on gp. So my question is what else can I do w/ out throwing parts at it not incl the battery I just swapped out.Could it be the distributor going ? Thought starter but on days when it starts it hits w/o issue
Thanks Again