hi iam larry i have a 2002 olds alero 3.4 and it was running just fine well heres what happened it had a broke exghust stud on the front causing a leake so i took it apart pulled the head and driled the out got it all back together and now it will start up and move but when u give it gas it lose power like its about to dies let off the gas its fine and it wont go any faster then 10 mph any advice be great i have went back over made sure rocker arms and push rods are seted and in rt stop all new gaskets