No Spark

[chico96ta]

Im at a loss, I am having a issue with my 96 T/A the car will start up fine when its cold but as it runs and heats up (20 min or so) the car just shuts down, then when I try to re-start it it might kick once but then no spark, I have replaced the opti, coil,icm,crank sensor, and just now the knock sensor and connector and Im getting 5volts to the knock sensor, what else can I try im at a loss. I just let it run for about 30 min in the drive way and it did fine moved it back in the garage shut it off then tried to restart it it fired up after 2 cranks. I let it sit for about 20 mins. tried to restart 2 kicks then back to no spark. Has anyone else had this problem. The car ran fine then I pulled the headers off to be recoated went to put back on now im having this issue