Bought a 78 trans am with ls 6.0 ltr noticed doesn?t have the power it should. So I bought a mpvi3 and download the file and noticed that my long and short term fuel trims are disabled and my oxygen sensors read.3 all the time and my ect is set to 285 I assume they don?t want closed loop involved or they never enabled them after tune or is this a type of tune they used any help would be appreciated