Hello my firens has an 1987 420sel.
It has a bad "miss" feels like a dead hole!!!
It has good plugs-distributor cap-rotor button-wires.
No leak at any of the injector seals.
Cam timing ok, marks on came match with "0" on the crank
Don't know about fuel pressure, but both pumps work.
Runs smooth above 2000-2500
but it shakes BAD @ idle!!!!!!!

What the H!!!

O can the fuel mixture on the air horn be just out???
Chris