New, wires plugs coils and injectors, no vacuum leaks, all emissions hoses routed correctly, pulled plugs cleaned and swapped #3 cylinder with #1 and #6 with #4, cleared dtcs ran the same idled for 12 minutes shut off. waited 2 min. started ran bad for 27 seconds cleared up ran like brand new. idled for 1 hour great no dtcs. Off and on few times great. turned off, sat for 3 hours started up P0300, P0303, P0306, shakes terrible no power smells like gas and a load hissing like a vacuum line or air leak, but none found.
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Hello,
Spray water on the rear of the intake manifold between the 3 and 6 cylinders. Likely the engine will change tone, run differently, and maybe shut off.
I suspect a vacuum leak due to a warped intake manifold, but test it, let me know what you find, and I'll help you run the issue down.
