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Message:: [QUOTE="ast26909, post: 8205482, member: 212644"]Your mechanic needs to ohm out the injectors and injector harness when the problem is happening, you are right this is an intermittent problem and it's very difficult to pin it down the problem is most likely the injectors or injector harness.  I have 13 Cascadia and it was having the same symptoms except it was setting codes for injector #5 & #6, when I ohm out the injectors at the injector harness connector #5 & #6 was out of spec.  I replace ALL injectors with OEM injectors and injector harnesses and problem went away. I would say you want to replace ALL injectors and the 2 injector harnesses under the valve cover it probably will solve your problems, it's possible you have more than one problem as you also have the speed sensor codes.  You can buy a set of brand new injectors on eBay for $2600 the injector harnesses they are about $200 from the dealer.  Use only NEW (eBay) or Bosch-rebuilt injectors (from dealer or M&D distributors), the rebuilt injectors on eBay are junk do not buy them.  The injectors only last about 500k miles on these engines so replace ALL at the same time you will save time and money down the road.[/QUOTE]