You can move the coil packs around and see if the code follows the coil pack. That' if you get a code for say, missfire in #2. Move it to #4 and see if the code follows it.
How many miles on the car ?
How long has it been on tune ?
198k, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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