Need some help from anyone who knows about cars!?

Recently have been having problems with my 2001 Kia Sportage, had the oil filter, pcu value and spark plugs changed about two weeks ago. Now whenever

Recently have been having problems with my 2001 Kia Sportage, had the oil filter, pcu value and spark plugs changed about two weeks ago. Now whenever I press on the brakes or turn my truck on, it starts to shake and feels as if it would stall. Scanner is reading a "PO171 System too lean bank 1" What should I have my mechanic change.0? I don't want to get overcharged on something I don't need, thank you!

or:Recently have been having problems with my 2001 Kia Sportage, had the oil filter, pcu value and spark plugs changed about two weeks ago. Now whenever I press on the brakes or turn my truck on, it starts to shake and feels as if it would stall. Scanner is reading a \"PO171 System too lean bank 1\" What should I have my mechanic change.0? I don't want to get overcharged on something I don't need, thank you!

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