I had a ka with bolt-ons. I installed a walbro and 2 weeks later I had fouled plugs and the whole time I lost like 2miles to the gallon just from driving back and forth to work.
Never got to check if it was the FPR, so I can't comment there but I increased by plug gap by .002" or .02" which ever it is and it gave a long enough spark to keep me from running rich.
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