I have a 1994 Mustang V6 and I just put in a new remanufactured engine. It has about 600 miles on the engine 180,000 miles on the body. The fuel filter got changed less than a year ago, I checked the fuel pressure at the fuel rails and got 30 psi which is what the book says it should be. I changed the upstream Oxygen sensors and got my exhaust system checked to see if I had a plugged cat after i blew the head gasket. I pulled the codes and got codes for both banks of the engine running lean but no other codes. I also used a stethoscope and checked all the injectors to make sure they are fireing. I also checked the vaccume line and that is up to par with what the book suggests. Im not sure what else to check so anyhelp or ideas would be greatly appreciated. The biggest problem i have with it is when i go to take off it just wont really go sometimes, it lags for a couple seconds but it doesnt go and it doesnt rev up really high either before it goes. Thank you guys, i love this web site.