HELP...Will not idle in gear

Another cause of decel stumble or stall is water in the tank. That one stumped me 25yrs.
ago, '72 duster slanty, cust's name was Ralph....nice guy. I had gotten to the point of riding
on the inner fender w/my timing light looking for ^^that^^,while another tech drove me in
the lot goooOOOO STOP!! After a couple of those, and an experimental bump of 5deg in the
timing,I decided that wasn't it. I pulled the bowl,cleaned it and the block/jets,and put the
carb back together. No sign of water in the dump when I pulled it. Seemed better for a bit,
but two mi. into the test drive it started again,pulled the bowl again... no real signs of H2O.
The fuel sample I took looked fine,the press. was fine, and it ran perfect otherwise. I was
getting pissed, as I didn't have an answer, and I was discussing pulling the tank. The car was
already a little rough to be polite, and i knew that could be a can of worms. The cust. said
"before we do that, let me talk to this old guy I know". That gentleman had a fuel/water
separator unit(maybe from a marine supply), and put it in before the pump. Guess what,1/2qt
later, they had gotten almost all of the water out,problem gone.The '72 system had a return
and would send part of the gulp of H2O back,but just enuff went in and sucked in the eng. to
cause the stumble,and the evidence was already gone by the time I'd open it up. FYI:coffee2: