2.8 Carb Swap//Weber K490//Vacuum Delete Help

[xxmetal]

Howdy All!

 

Problem: '86 2.8 stalls once it warms up. Starting cold, it runs a little rough for 2 minutes and clears up. I'm then able to drive fine for 3ish minutes. After that point (back in park) idle RPM kicks down and it sounds fine idling normally. As soon as you give it any accelerator pedal from there, it chokes out and stalls. 

 

Work done: I already pulled the carb, cleaned and rebuilt it with new fuel filter, etc. No noticeable change. It's running rich so fuel pump is fine. Replaced plugs, plug wires, coil, for good measure. Replaced all soft vacuum lines.

 

Proposed fix: Going to drop in a Weber K490. When doing that install, what vacuum lines am I safe to exclude? I'm not sure if the overall issue is carburetor or vacuum-related, so I would like to cut out as many components as I can. My county does not do emissions testing, so I am not worried about that aspect.

 

Any other tips/tricks from 2.8 owners who have done this swap would be appreciated!

 

Thanks!

[ratrapp]

ive done this to my 86.i hate to say but I'm on my second carb after just a year.the one thing i did learn was it is picky about fuel pressure.ive got mine set at 3 lbs by webers instructions.i bought a cheap mr gasket gauge and regulator but in hind sight ive shouldve got alittle better set up for the gauge and regulator.it took a good while before i got the pressure to stay consistent and match the gauge.also if you have an automatic then you may have to modify the kickdown cable and to fit the carb .ive passed the truck on to my nephew and wish there was a better alternative but i havent found a simple alternative.