so we recently changed the sparkplugs in both mine and my dads truck and my truck is fine but his truck now chokes down if he takes a turn too slowly and has stalled on him backing out of the garage we replaced them w/ autolight 5224 which the auto shop told us were the factory equivalant to the champion rc12lc4. so my question is why is it diong this only since we changed the plugs??? he is going to buy the champion plugs that are the same number when he goes out today but why would the plug do that??

the only difference is that the electrode doesnt stick out as far on the new plug as the old one

 

did you gap them correctly? never trust the "pre-gapped" ones.

 

Ide i only use Autolite 3923's

 

yes I gapped them when i put them in for him and what is the difference btwnt he autolite 5224 and the champion rc12lc4 and autolite 3923???

 

5224 is Platinum version of the Autolite equivalent of the OE Champion plugs. Some call it a "truck plug". I have not heard of much success with them in a 3.9. 3923 is the Autolite plain copper plug that is one heat range colder than the OE plug. 3923's run very well in the 3.9. There is no need for platinum, iridium, plutonium or kryptonite, whatever kind of plugs in the 3.9. I know you didn't ask it but NGK copper plugs run real well in the 3.9 too.

Jimmy

 

NGK V-power FTW!!

 

Did you check that plug wires were replaced correctly?

 

Our engines only run well on copper plugs, the 4.7s have had good exp. with platinum, but as for the 3.9, 5.2, 5.9 use copper.

 

im pretty sure the 5224 are copper plugs bc thats what my dad said he asked for(he bought them, not me) and yes everything was replaced coreectly and on the right cylinder i did it for him so i know that it is correct and done completely

and according to the internet the 5224 are copper core not platinum

 

got that off dodge talk read it and take a look at the links, looks like it could be due to the adv. in timing.