I have a 2004 vin z 5.3 with a p59 ecm and standalone harness. car is sitting on jackstands and waiting on driveshaft but at initial startup it wont idle worth a crap. hours on you tube and this forum i have finally decide to ask for help cause maybe i am missing something i dunno.. this is my first ls swap and finally accepting the fact about the learning curve.. well school me yall i really need help understanding whats going on. if anyone with a stock 5.3 idle log file i could compare to it would be greatly appericated. i'm not against trying to figure it out but i dont know what normal idle numbers are suppose to resemble as in how much airflow is needed at idle in lb/hr or if i am getting skewed numbers from a fauly sensor. the motor came out of a 2004 suburban and ran fine before i pulled motor transmission was missing overdrive but still drove ok with 1st and 2nd (never went fast enough to get to third) and pulled and swapped into fox body and installed and didnt change anything but vats and been playing with stuff but anyways any and all help is appericated.. just want to learn is all.. ill attach a log file also. base tune with e temp.hpl