Hi folks, I'm new and really appreciate all the technical information I have already read about. I have a problem with a 3.8 throwing these codes for lean mix on both banks. It started shortly after I had replaced the intake gaskets and PCV valve. When I removed the upper intake, I found a 3/8" tube that had fallen out and was laying on the lower intake. It appears this tube goes back up to where the PCV valve is located. If this tube falls back out can it cause these lean mix codes? Can an aftermarket PCV valve cause these codes. I haven't had a chance to check the fuel pressure yet but I plan to sometime this week. I have replaced all the vac hoses going to the intake and checked the other ends at the solenoids and modulator etc... Another problem I am having is when you crank this thing up after a hot soak the engine will have a roll to the idle. If you put it in gear it will actually jerk the car forwards or back depending weather it is in drive or reverse. My LTFT are reading over 10% so I know I do have a problem. I did replace the fuel filter recently and cleared PCM memory and reset fuel trims but they came right back up showing the PCM is trying to richen the fuel mixture up. Are there any common problems on these engines that cause these lean mix codes. This car has over 190000 on the meter but runs like a new one other than the lean mix problem. I bought the car with around 180000 on it and no codes. This lean mix problem just slowly started coming on and has gotten worse over the past year. I do believe I may have a leaking brake booster but I have tried unhooking and plugging the vac line to the booster and the STFT and LTFT don't change. Any ideas?
