Has anyone had the connector for an injector go bad? (1 Viewer)

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Toyota is telling me the only way to get the plug housing is to buy the entire engine harness. Can you direct me to where I can get just the plug housing?
Have you ever replaced the spark plug tube seals that are pressed into the valve cover. Oil in these tubes is the #1 cause of misfire according to the FSM. I had a low rpm misfire like you and replacing these did the trick. However, when my HG blew a month later I found two injector sockets broken, bare wires at the EGR and other issues due to age so I replaced the harness.
 
Have you ever replaced the spark plug tube seals that are pressed into the valve cover. Oil in these tubes is the #1 cause of misfire according to the FSM. I had a low rpm misfire like you and replacing these did the trick. However, when my HG blew a month later I found two injector sockets broken, bare wires at the EGR and other issues due to age so I replaced the harness.
No sign of oil in any of the tubes.
 

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