So I was running fine until I lost 1000 rpm and 10 mph I got new plugs had a compression check done spark test everything checked out fine. So I bought the diagnostic software ran a injector test fuel pump test oil pump test all was good It said there were no codes?? I took off the black air box because I herd a whistling sound coming from under it and I had a little brass screw missing luckly I found it I was kinda hard lining the threads up on it but I got it installed. I was hoping that was gonna solve my prob but it didn't anyone know what else I can check? Please help! Any suggestions will be much appreciated!