Thank you for the fast reply and good info Dave, I was wondering if the fuel pressure was too much and I have an actron fuel gauge and tap on the way to check it. I will try the stock spring and see if that helps. Is there any way to install an adjustable regulator in line on the return side? I was going to put an allen head screw in the stock one but it looks like a pain to get to and don't want to take it apart to fine tune the pressure. I was looking at the wide band O2 kits but wasn't sure what brand or type would be best. I will study the links you posted, and try to pick out a good WB O2 kit.. Thank you