You may be running up against the safety system built in. In my experience, the 986 top mechanisms are "dumb" and will destroy themselves if improperly adjusted and the motor forced to do its thing.
The 996 Carrera cab I had would stop moving and blink the lights if anything was sensed to be out of alignment. I'd suspect that your 987 is the same and just needs an adjustment of the pushrods. If you're near the city and you want to bring your car to my garage space in Brooklyn, I'd be happy to take a look. I've never touched the pushrods on my 987, but did break, rebreak, and then finally properly adjust them on my 986.
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"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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