Originally Posted by bordum128
I have had my truck in the shop for 2 straight days looking for my vacume leak. I have my Check Engine Light on with the error code P0171 and P0174 "System too lean". Still cant find it. Good luck buddy!
Don't mean to hijack the thread.
Check the PCV line. There are rubber elbows that crack and cause those codes. The cracks are hard to see. You have to take the line off and inspect it. Good luck.