I've been having problems with my 78 MC stalling at speeds over about
50 MPH. It seems once the car shifts from 2nd to 3rd, I have to be real easy on the gas or it stalls. I've replaced the fuel filter, which did turn out to be part of the problem and I had the fuel pump checked. No problem there.It has a 305, so probably anyone with a late 70's 305 could answer my question.
On the thermostat houseing, there are 3 vacuum ports. A top one, middle one, and bottom one and they're kind of staggered. I just noticed the middle one has no hose on it. I can't find any loose hoses anywhere and I also can't find a corresponding port anywhere else. There IS vacuum on that port. I can feel it fairly strongly. I'm thinking that might be messing up the vacuum advance on the distributor. If anyone has a 305 of this vintage, or knowledge of them, would you possibly be able to trace where that middle vacuum line is supposed to go so I can replace it?
Thanks a million.