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More than likely you either picked up some dirt in the gap or cracked the porcelain of a plug or two. Possibly you may have disconnected the connector to a coil(s) while re-installing. To find the culprit disconnect coil connectors one at a time from each coil while the engine is running. If you disconnect one and the engine doesn't run worse you have found a cylinder that has a problem. Please be careful while doing this and don't place yourself in a precarious position, I'd hate to read that you were injured while doing this.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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