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try another bottle of techron and a tank of premium..........its harder to have pre ignition with higher octane fuelmy 2.4 will just about get to 7000 rpm and I hear no preignitionalso on the working end 2000 to 2500 no noisemine has 343,000 miles on it.I do use the crc direct injection cleaner about every 10000 miles and have not had any ill effects yet.I get the 300 code once every 6 months but it goes awayoem plugs are the way to go........please check gap
 
Discussion starter · #23 ·
All has been working great since the switch to OEM. Glad it was that simple. I hate that I wasted money on other plugs but I’m glad for a cheap fix.

Could be a simple and cheap test to get the factory plugs in there and see what happens.
 
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