Got my car running again after sitting for about a month (was getting the ecu repaired). After a couple days of driving it, i got a P0170 code. Got it scanned and basically said my PCM was making my car run lean or rich… what do i do to fix it??

 

I would first run a B-12 or Seafoam induction on it, and run a tank with Techron or Gumout Regane (both with PEA cleaner) through it. Do these basic maintenance items before throwing any parts at it or going further.

Short-term fuel trim issues are often air metering (or leak) issues, or fuel flow issues on older, higher mileage cars.