Hello, I just joined tonight and posted a similar problem. I have a 2005 STS, my codes stated that I needed ignition coils and injectors. I bought brand new injectors, and used old ignition coils that i saved from my original engine that blew. I still had the problem. I then bought a map sensor, a maf sensor, spark plugs, tightened the air intake bolts on the manifold, and still had the problem of stalling and no power. Last thing i recently did was buy brand new ignition coils and along with the ignition harness for both sides. Drives perfect now.