Engine Cutting Out Again, Severe Miss Options

[PDXBob]

Hi 914’ers,
This is a revival of my old post about the same engine cutting out problem on my 1975 914 (1.8L). It cuts out generally after warmed up and driven for a while. Usually happens under load, like when I’m going up a hill. Doesn’t miss on idle or when I rev it up in the driveway. Based on the work I’ve done so far I’m now thinking must be fuel related.

Here’s an (unfortunately) long list of what I’ve checked or replaced:
- new Spark Plugs and wires,
- new 123Ignition distributor, coil and distributor cap
- no vacuum leaks, all ground wires appear in contact and good shape.
- ECM wiring appears good and I’ve tried wiggling its wires to see if any faults
- Tested the TPS and it’s good, also AFM flap moves smoothly.

A couple of other interesting things- I didn’t drive it for about 2 months, and after installing new distributor it ran great for about 2 weeks. Also, on Friday it was cutting out bad, then I stopped at a store for about 1/2 hour and when I restarted and drove home the cut out had disappeared.

So, I’m now think fuel system related.
Any ideas would be greatly appreciated!
PDXBob

[PDXBob]

I’ve been working on my bad cut-out/miss, and am redoing a few of the ground wires that seemed a little frayed. One thing I’ve noticed is that F.I. Wiring is “brittle”, and not the good kind of brittle, as in (peanut) brittle.

As some have suggested, I’ve tried jiggling FI wires while idling, and it doesn’t cut out then, but this harness may be on its last legs- 50 years old. May have to inquire about cost of good used FI harness. Hate to just continue to replace parts without knowing the root cause of my cut-out/miss problem though.

I still need to check out a lot of things you all have suggested.
Thanks again for all of your ideas!
PDXBob