OK, when you say you got gas out of the regulator hose, I take it you are talking about the Vacuum Hose, if so you need to change the regulator.
You said it seemed to do better after changing fuel filter. So the hard starting was even better? If so I would say the problem lies in the fuel system. So, as I stated above about the pressure regulator change it, there should NOT be any gas coming out of the vacuum hose.
Also go by your local auto parts store and have them pull codes.
If still doesn't fix problem please post.
Make = Chevy
Engine Size in Liters =?
8th Digit of VIN# =?
Drive Type = 4x4
Sunday, August 2nd, 2009 AT 2:09 PM