some one must know

[oneslobuick]

why does it run rich at idle with the fuel pressure as low as it will go but runs lean at a cruse, then back to 128 blms at wot????

 

[BoostKillsStres]

MAF tables being out of whack in the chip can certainly throw the BLM table off and cause this, it takes quite a bit of work to dial them in. Once you change the intake and exhaust airflow on our cars like we all do it throws the stock settings off. So logging w/ something fast like DS and adjusting the tables is whats needed to bring the MAP back in line.

Any kind of vacuum leak is also a huge problem so check everything you can possibly check for that. Zip tie hose fittings and make sure all hoses are in good shape, put a new GM pcv in it make sure you have no exhaust leaks or cracks in the headers.

 

[XLR8]

A lot of chips lock the BLM at 128 at WOT.