Pontiac Firebird 1967-2002 - 94 formula lt1 runs good for 10 min then...

my 94 formula begin to hesitate when reaching operating temp
when cold it goes good 550 at idl in drive but after 10-15 min 500 rpm at idle
and begins to hesitate .
new msd opti
new coil and icm
new ect sensor
new plugs ac-906 and delco wires
fuel pressure test 42 psi koeo,35 at idle
ive made a compression test all 8 cyls between 210-215 psi
no vaccuum leaks i test it with starter fluid
when i unplug my maf no change so if someone have an idea what is wrong please help me;)

You should post this in the LT1 specific section.

http://www.ls1tech.com/forums/lt1-lt4-modifications-31/

I had the same problem and it ended up being my MAF, but who knows.