Make sure you have the ignition for this, plug gap correct, correct heat range plug, and don't have the tune-up overly rich to begin with. You need to consider that you're adding supplemental fuel and will add to the fuel mixture. Just something to think about. There are formulas to calculate how much nozzle to use based on the amount of supplemental fuel you are looking to inject. Be careful and sneak up on it. Too much too soon and you can put the fire out. Safeties on the EFI may not be a bad idea either if you end up tuning for it. My .02. Good luck!