slight stumble

[USMC302]

Every engine is going to want different timing, be sure to set it with the spout out obviously and I would start with 13 degrees advanced and move up 2 degrees after each test run(spout in for run). Once you start pinging, back of the last two degrees and keep it there. Timing will be sensitive to the octane you are using at the time of tuning. If your going to run 89 in the car, then tune it with 89. The higher octane you run, the more timing you can run in the car. Let us know! Good luck.