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Many miss-fire problems with the RB26 motor can be attributed to the ignition system, as part of the procedure for determining a miss-fire cause, it's a good idea to inspect the coil packs. If you don't know how to get the coils out of the engine, follow my guide for Compression Testing up to the point where you have the coils out. From there you need a multi-meter, you're hoping to see a resistance between 0.6 and 0.9 Ohms, anything outside this range means the coil-pack is finished and is likely causing spark issues.