Ok, i was lookin for a little help....
my z28 is a 97 with a lt1 in it.
it seems to run perfect until it gets hot.
so ill drive for 30 min and shut it off, than it wont start until i cool it all the way down (typically more than 2 hours)
ive checkd all the relays and replaced the ignition module
the computer shows about 5 or more trouble codes such as "emission control system failure"

let me know if anything comes to mind...
my mechanic said i should take it to the dealership cause he cant figure it out...

thanks

 

Post the trouble code numbers.

Check the fuel pressure.