tappets help

[99casst]

hi guys no this is a issue best looked at but u may have possible suggestion. the other day i cleaned my first bank lifters out every thing was good no horrid rattle. so thought no need to do the rear bank. then the issue started a horrid whistle noise now i dont think this is caused by me cleaning the bank out but needed to tell u everything just in case. it sounds as if its a air leak but when i listen to around the coolant tower it gets louder so somewhere in that region it almost if it is coming from the first bank injector rail. as when i start to slide the conecting block on the wiring loom for the injetors away it stops making the noise dont no if this is just a coincidence or may be the rail. other than that it changes throw out the revs e.g its there or its not