Hard warm starting

[Mark L. Chang]

Now I'm getting stumped. Patient is our lovely '91 90q20v. Problem is hard
starting when warm. First start in the morning, beautiful. No problems.
Drive around, all is good. Stop, get out, swing into Taco Bell and eat
lunch in. Come out, hard start. 5 seconds or more.

So, investigating I found several problems that could have been it, and
fixed them all.

1) Fuel line leaks. Lots 'o leaks around the clips. Man, that was ugly.
2) Replaced 4 of the 5 injectors. Cracked, dead, and ugly.
3) Replaced fuel pump check valve and fuel filter. Check valve looked
   somewhat okay, but who knows.
4) Replaced plugs today with F6DTC. Just part of the tune-up for spring.

All this has resulted in no improvements. Well, maybe a few seconds less,
but still, it's hiiiighly annoying. Please, any thoughts?

--
'91 90q20v