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On a K-jet, say a turbo, the symptom is too much cranking to start. Period. Running is fine. Hard start and a minute or so of poor running and stumbling is more like a CPR (control pressure reg) failure. This is on K-jet, mind you.
Commonly, the wires fall off the thermal time switch because the connector degrades or some mechanic decides not to hook it back up after doing something else.
I'm not sure you have one on an 89 LH though since there is no 5th injector. If you do, I am not familiar with ts failure on those cars.
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