Get a program that monitor live data while you are driving (I use Torque and Torque Pro)

Looks like you changed everything except what most people would do and that is to check the MAF.

Now don't go pulling the connector to test it like some people would have you do. Look at the MAF g/s at idle, at wide open throttle and when you are coasting. Sounds like you have a MAF that under or over reporting the airflow.

And if you do decide to replace the MAF sensor don't go to eBay or Amazon to buy the cheapest MAF from Wing Wang or Wing Wong. Get a Siemens or VDO MAF sensor.

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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD