Hello. I have 2003 Pontiac Bonneville ssei. Used hptuners vcm suite to try and diagnose hard starting and rough idle issues. I am new to this so i don't understand a lot. The scan shows that LTFT B1 is red on start up and idle. I replaced crank position sensor, MAF, o2, iat, fuel filter, I checked spark plugs and wires and just cut off the catalytic converter to straight pipe. Still the same issue. I noticed that when i increase the rpm, the LTFT B1 shows a normal reading. Does anyone know what is wrong or what I should try next?