2006 SS (2.4L), all stock, 145k miles.

I'm getting 4 codes on it at the moment, and I'm trying to fix it with as little time and money as possible so I can clear my emissions test -_-
p0121 (TPS)
p0171 (Too lean, bank 1)
p0301 (cyl 1 misfire)
p1174 (fuel trim balance)

I was going to clean the MAF, but it still looks brand new (it was replaced during a tune-up at approx 110k mi.). Checked all the wiring for loose connections and/or exposures and all looks good there too. Now I'm on to replacement parts and trying to figure what my most likely culprits are for the set of codes I got. I figure I at least have to replace the throttle body, since as I understand I can't replace just the TPS in it, and I figure I'd need to replace the fuel injectors (after all, they got 145k miles on them, and the spark plugs only have about 35k). Would those two repairs possibly cover all the codes I have, or is something like the p0301 going to mean a new plug or coil still?

And for what it's worth, the symptoms I'm getting are somewhat rough idle and occasional loss of power when accelerating.

 

I would start by changing the spark plugs, make sure all the wires look good for the tb, if not then yeah you might have to replace the tb and go from that see what goes away after that

 

Thanks, Snail.

I did check the TB wires already, so I figure a replacement is my only option there (unless a "rebuild kit" exists somewhere). I wasn't sure what the chances of a plug going bad so soon were (Bosch premium plug at that), or if the misfire would more often be due a bad coil or injector at that point.

 

Well it could be any of those. To test the coil you can swap them with another cylinder if the misfires follows the coil then the coil is bad. If it doesn't then keep looking. After the coil swap i would just buy new plugs to be honest

 

i had to replace my tb when i got that same code. at least its an easy install