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Hello, what codes are you getting, that information didnt post.
Ok both transmission codes indicate a fault with the transmission Electronic Pressure Control solenoid circuit. It is a short for the circuit,commanding minimal line pressure. If this is a 4R70W transmission, it is an issue with the solenoid in the trans, the internal wiring or wiring to the PCM or PCM itself. Misfiring would be a totally different engine running issue.
With it setting EPC codes, Id suspect a problem with the epc solenoid or internal trans wiring, the trans bulkhead connector can leak fluid and cause a short circuit. Unplug the trans main connector at the right rear of the trans and check for fluid inside.
Then I would suspect an issue with the solenoid itself inside the trans and the internal wire harness should also be replaced along with the sensor. Drop the pan and inspect for metal debris, If there is metal, then there is an internal transmission failure.
Only if the transmission was causing an issue dragging, not spinning properly. A misfire could be anything from a failed coil, spark plug wire, lack of compression. EGR port plugged up. Many different possibilities that would have to be further diagnosed.
Block off the egr vacuum supply, if the misfire goes away (assuming its under a load at highway speeds) then the egr ports are plugged up in the lower intake manifold. The upper intake manifold would need to be removed to clean the ports. If it still has a misfire and it runs rough at an idle, it could be an injector flow issue, or valvetrain issue. A compression test would need to be done to check the base engine condition.
Not the egr valve, the runner ports for the egr system in the intake. The transmission can be trying to stall running at minimum line pressure
Hello, do you need more help with this concern?
Hello, the question remains open until it is rated, if you need more help let me know.