1976 Eldorado missfiring problem

[Lukas S.]

Thanks for all the tips and suggestions, i've already reassembled the carb for the 5th time i managed to get spec in pdf for all rochester quadrajets so if anyone need info about the adjustment of the float etc i got the datasheet for all models!!

After reinstalling the carb, car started much faster but the misfiring didn't change much. I'm still getting weak vacuum on idling.
I'm ordering all the parts to cancel as many possible trouble makers, so ignition cables with distribution cap and sparks and full gasket set for Quadrajet with new needle valve. I'm also thinking is it possible that the valve lash is not correct on those cylinders ?, i doubt as i got nice compression 10bar reading on those cylinders. I'll keep you posted.

[Lukas S.]

Is there any point to change the big metal intake manifold gasket? or if its supported by sealant like Victor Reinz there is no point.
I sealed it big time, so i don't think i have leak there.
It's not broken but old and tired.

["Cadillac Kid" Greg Surfas 15364]

Lukas,
I think the ignition is your source of this malady and changing the plug wires and the distributor cap will correct the issue.
Greg Surfas

[TJ Hopland]

There is no lash adjustment on the stock rocker setup on these engines.

We will see what the tune up does. 

I can't remember did we ever rock the crank and watch the rotor to get an idea of the timing chains condition?