98 concorde starting problems

I have a 1998 chrysler concorde LXi. Every so often it wont start, and
its happening more and more. so far there are only 2 conditions that
it wont start that often. when its low on gas, and when its hot. about
80% of the time when its above 70 or a sunny day even it just wont
start. I have had the plugs changed, battery, checked compression,
etc.

heres what happens: then engine will turn over, it just wont start.
every so often it does start, and it feels like its missing quite a
bit (3-4 cylinders). then other times it runs like a champ. aften it
gets running (even when it feels like its missing) I rev the engine a
few mins and it will run fine till its off.

I have taken it to many mechanics, spent close to $1k fixing it, and
everytime i get it back, the mechanics either cant find the problem,
or tinker with this/that and say they fixed it. PLEASE any suggestions
would be great.
my guess would be a fuel problem, but ive been told the fuel system is
fine.

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