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Your 306 code means you have a misfire on cylender 6. That may be the cause of the po 125. Inspecdt the coil, spark plug wire, and spark plug on cylender 6. With the age of the car I would replace all 3 items. If you want know how to test all 3 I can tell you process of elimination is the way to do it. Do you know how to find cylender 6
Hi: I would use the NGK Plugs Myself:
Spark Plug is a NGK-Laser-Platinum (NGK PART # 4997) You Know Theres 2 Plugs Per Hole. I Think you'll Be Very Saisfied with These Plugs.
Did you use the recommended manufacturers spark plugs for your car? are they gapped as per the manufacturer...did you break a plug wire inadvertently while removing the plugs or crack a spark plug insulator(the white porcelain part of the plug)? did you knock a vacumn line(hose) off the engine when working on the plugs?
hemis take 16 plugs every 30k. doesnt matter if its a 5.7 or a 6.1
9.25 axle take 75w140 plus limited slip additive. all others take 75w90 and dont require additive. t-case takes atf+4 should be done at 30k also
There are 4 small coild on the top of the motor, these are the ignition coils, 1 per spark plug. You have to pull the coils and the spark plugs are under them.
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