Hello Brickboard

I have been picking away at my 1974 145 with a kjet B20F for a while now. It had been sitting for nearly 30 years so I have had my work cut out for me. Nearing the finish line now but faced with a new problem.

The car idles well and steady at 900 rpm as per the green book but will not rev smoothly. If I give it some gas it will slowly ramp up in speed but nothing steady. There is some popping occasionally on deceleration. Unfortunately the car is not drivable in this state. Gutless is what my Dad would have called it.

I have set the timing at 10BTDC at 600 rpm as per green book. There is good compression on every cylinder. I have checked for air leaks everywhere I can think of. I ran a test on the injectors (which were new last week) and they are equal for flow across all four. The system pressure is running a steady 70psi. Control pressure is also good and rises to around 52-54psi when warm. Using premium gasoline with no ethanol. Brand new fuel filter.

Does anybody have any ideas? I have some time off work this week and would love to get to the bottom of this.

As always, any guidance would be gratefully received. Thank you Brickboard.