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Not sure if this will help but I had an issue after my motor was pulled to put a new LTW fly wheel on many years ago also and 87 930.
The issue I had was the car would cut off or just act Erratic sometime stalling and or gauges with do weird thing.
I wrote to the PCA 930 tech guy at the time. He wrote back to me pretty fast and said check the ground for the intercooler. If the mechanic did not run or put the ground for intercooler back correct it will cause all sorts of problems. Ran a dedicated ground wire to some place and made sure all connected and car was perfect again.
One other issue I had a few Summers ago I stopped for Fuel 93 octain super at a BP gas station in Vernon NJ and drove away and car started Stumbling and almost died a few times then woud Rev up if i recall ended up as bad fuel.
Prob water in their tanks or something.
I used some high end fuel inj cleaners and ended up taking it in for new fuel filter and Fuel accumulator if I recall. Loaded 930 up with some Sunoco 94 and got on the boost and all sorts of black smoke came out and car woke up and ran as it should.
Not sure if any help but worth a try. Good luck.
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