<VV> 110 PG with rough idle and wanting to stall at stops

[Stephen Upham]

I developed a problem during a club out of town activity last  
weekend.  The Monza ran fine on the way down at highway speeds and  
after arriving, at town speeds.  I parked it on the town square for  
the show.  After the show was over it started and ran fine for about  
a mile and a half.  Then it started to experience a rough idle and  
wanted to die in drive.  I ran ok in neutral but I sensed that it  
wasn't 100%.  I was able to drive it back to Dallas without too much  
hassle except for the time I stopped for gas to check for leakage on  
the new oil pressure sensor/sender.  The old one began leaking, and I  
and some members had to replace it in the parking lot of the hotel.   
Fortunately, it wasn't raining at the time as it had been pretty much  
all day.  I drove back to Dallas in the rain which was moderate until  
the last fifty miles which were torrential.  I got a damp carpet on  
the driver's side from the high beam switch to the seat.  I  
disconnected the battery when I got home and fan dried the interior  
for two days.  Well, today I started it up again.  It took several  
tries to get it started.  After it warmed up, I checked the advance  
and it is where I have had it for the last five months at 24 BTDC.  I  
checked the rpm at idle and got about 900, fast, I know, but remember  
that it was dying in drive at stops, so a club member stepped up the  
idle.  In drive, the rpm drops to 600 and it begins to run very rough  
and the engine is vibrating to the stroke of the pistons.  It kept  
running, but again, very rough.  Almost everything on the engine that  
involves fuel or spark is less than seven thousand miles old and the  
carbs are about 500 miles old (fresh complete rebuilds).   It has a  
Petronix ignition.  One of the club members suggested the PCV may be  
loose (it is the kind of hose configuration found on the A/C cars),  
another suggested it might be water in the gas from a bad fill up,  
and the other club members were scratching their heads.  I need some  
advise as to what to check next.  I did think tonight to check the  
carbs for leaking venturi which I will do in the morning, and then  
maybe pull the plugs and see if there is anything I can glean from  
them.   What else should I look for?

Stephen