My '74 1.8 L-Jet 914 has developed a light load hesitation/stumble. It is the most pronounced when cruising on flat ground with light accelerator application, maybe 10% opening of the butterfly valve. The stumble is not noticeable when accelerating.
The car has:
- New vacuum lines
- New plugs, wires, cap, rotor, and coil (still running points)
- Cleaned throttle body and checked operation of TPS
- New accelerator pedal and throttle cable
- Rebuilt MAF
- Recent valve adjustment
Does anyone have any suggestions for how to proceed with diagnosing the cause of my light load stumble