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Just want to share my experience with aftermarket Dorman gaskets.
Recently had to replace the IDM for a fault, and while doing so, replaced both sets of UVC harnesses, gaskets and connectors, since they were melted. MY truck is also a 96 PSD , but it has 280,000 on it.
After many headaches, and trying to figure out why the IDM replacement wasnt working, we traced the fault back to an UVC harness on cylinder 8.
This was replaced, and the buzz test showed that the system passed.
Needless to say, put the valve covers back on, drove the truck for a day, and truck felt a little powerless. Buzz test revealed that cylinder 5 was malfunctioning. Turns out the clip that holds the connector on the injector was coming loose, not seating very well.
Took the Dorman product out, replaced it with OEM International parts, trucks been working without issue.
In my experience, the savings of Dorman aftermarket was not worth it to the cost difference of the International parts. Whatever you decide, hopefully your experience will be better than mine.