The orange / red spark is evidence of reduced voltage. The bright blue / white is where it should be.
As already suggested the culprit is most likely a poor earth or old wires / plugs not longer being up to the mark.
More importantly:
One warning:
Modern energy systems can produce LETHAL voltages so don't go poking around with the engine running. It may be the last thing you ever do.
By the way Welcome from me as well.
Cheers , Pete.
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