Q: Runs rough & missing
on 2005 Cadillac SRX

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Bestsie runs rough (like missing) when I’m stopped in or out of park / neutral, if I take off lite I feel a little miss if I take hard (in auto not using the sport shifter) it’s not as bad. Now, on the highway when I’m in 4th or 5th gear and I’m trying to pass someone she spudders and may draw back then I use the sport shifter and drop her down a gear then she’s fine. It seems that I feel the missing when the engine isn’t racing high. Took her to the local auto parts house that offer free computer code analyzes and I was told (not the code) plug #3 was misfiring and I needed to replace the plug so that where I’m at now 6 plugs in hand and ready to put them in. I’m praying that’s all it is and nothing more (I had a 3.6 go out on me before because the chained slipped and destroyed the engine). What else could it be? And this is my 1st time changing the plugs on a Cadillac, any tips?
(1) Answer
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Cod stored was probably P0303 which woul signify a misire in number three cylinder which could be a plug, coil, injector, or engine mechanical problem but start with the basics first maybe check compression is even in all cylinders but replace the plugs. During replacement look at the plugs and see they are uniform in color and none show mechanical damage or oil fouling. Autozone have some popular workshop manuals for free on line once you register (for free) on their website There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate