Join Date: Jun 2011
Location: Tinley Park, IL
You need a tune!!! With a SAE smoothing of 5 and your graph is still that wavy... Your issues lay there. Remember, every car is different even though they all came off the same line and that tune that GM puts in, doesn't benefit every car.
I'll give you a quick example from when I had my GTO. Two buddies of mine and myself all had/have 04' GTOs. buddy A had a build date of 12/03 and buddy B and myself had build dates of 04/04. We all did similar mods on all three cars (at first) and buddy B and myself always benefited more from the mods than buddy A. Even stock dyno numbers were different between all three, though buddy B and mine were closer and higher than buddy A. All cars were the same, all 04's, all LS1's and all six speed manuals... So you might be victim to a shitty tune or victim to a monday or friday car.
Either way, that car needs a tune, bad!
Left a 421RWHP 2004 GTO, but honestly loving the G6 GT coupe!
87' white Firebird(sold)
01' green Grand Am SE2(traded for the 03')
03' orange Grand Am SC/T(totaled)
04' blue GTO(traded for the G6)
00' tan Montana(I swear, its the wife's)
06' black G6 GT Coupe