hard warm start 85 CGT

[DGraber460@aol.com]

The car is an 85 CGT  recently turned 100000 miles, second owner. In the last
four months it has gradually started harder when full warm and left for about
10-15 minutes. Cold- it starts fine although has been sputtering a little
after first firing up. Hot start is fine. Power and acceleration are very
good. I did the "list suggested" ISV clean out some months back but not in
relation to this problem, and I can't see any connection there.  TIA

Dennis Graber