Hard Cold Starting...

[Robert Bailey <baileyr@direct.ca>]

My 87 5000S (with NF engine) is starting to have a cold starting problem. 
It actually starts fine, but then immediately dies. I suspect the ISV, 
since I had some problems with it before, cleaned it and the went away. 
If you hold down the gas it will run, but the first time I saw it 
happening, it would hesitate off an idle and pop (backfire) like crazy. 
Holding down the gas eventually would build up the revs, but it sure 
didn't want to run. It took thirty seconds for it to go over, say 1100 
RPMs, hesitating all the way. It doesn't seem to act this way now if you 
give it plenty of throttle as you start it and hold the revs up once its 
running. Any ideas?

Rob