RE: 2.4 Glitches - It Does Happen!
Loopman, usually a resistor plug has an R wriiten on the model number.
But this is not always the case, for my Homelite engineI installed a Champion 5851. My original plug was a DJ7Y ,and the 5851 replaces that plug and the RDJ7Y ( a resistor plug ). The nice lady behind the counter called the factory rep and asked if the 5851 is indeed a resistor plug - the answer is yes. Why it doesn't have a R in the number I don't know.
Bottom line the 5851 fixed the glitches I was getting.