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1998 ZX-9.
With the engine running like crap decide to check the coils/plugs. Removing #1 or #3 coil shuts down the engine. Removing #2 or #4 and no change in engine idle speed, engine stays running. Pull the plugs out to see if they are firing, all are firing. Any ideas why the engine shuts off when I pull 1 or 3, but not 2 or 4?
 

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sounds like its only running on a cylinder or 2. get it started (make sure its cold) and touch the header tubes 1 at a time and you will know which ones are not fireing for sure. you said it had spark on all 4, so from there i would check the carbs on the one or ones that are not fireing. Check for anything that might be pluged and causing it to not get fuel. Hope this gives ya somewhere to start anyhow

Good luck
Chris
 
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