2005 Trailblazer 4.2L I6: Recently purchased this vehicle and had a new fuel pump installed since the fuel gauge was not working. Immediately afterwards, I was getting the P0455 code. Tried the new gas cap, then had them check their connections again, but still getting the code. Rather than...

Guys, The past two times my wife has filled up with gas, the car has been extremely hard to start, requiring 20 seconds of cranking and finally putting her foot on the gas. It then runs erratically for the first minute or so. After that, it runs fine until time to put more fuel in it. Two...