[johnman001]

So, as a follow-up, my running issue seems to have fully disappeared by unplugging my shorted altitude sensor.

The car once again seemingly has full power and pulls strong all the way to the rev limiter in at least the first 4 gears.

My issue may not directly relate to most as my engine is transplanted into a 914 with the altitude sensor mounted under the passenger seat and had been that way since 1991. In the last few years with little or no clearance between the bottom of the passenger seat and the top of my old altitude sensor, eventually, my pressure can was crushed just far enough to allow the limit switch contacts to close sporadically until it finally became crushed enough to close the contacts permanently where I could finally find the problem.

My suggestion would be to mount the altitude sensor such that it would never see pressure against the outside of the housing. For completeness, I did purchase a used unit and mounted it so it won't be pressed against while keeping all the wiring and sensors per factory wiring diagrams for the engine.

Someday, someone else may end up working on it and I'd rather make it easier on them if they have access to factory manuals.

I thought I would pass on what I had found just in case someone else may run into similar running issues.