i got a 2007 chevy van that is giving me running rich code on bank one and two. it runs fine except for when u first crank it up, it will run bad for like five seconds. any ideas?
check the fuel pressure regulator vacuum hose,probably has fuel shooting out of it all the time,its not supposed to,this is easy to spot and fix on these motors,first thing to check anyway.
change your oil if this is the problem,it'll wash down into the crankcase and you'll be running gas and oil in the crankcase,not good.
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