To answer some of your questions....it is still stock air filter so thats not an issue and as far as the MAF goes, when he tested the voltages from the MAF it wasn't reading high enough at WOT....it was only going to like 2 volts or so when it is supposed to be between 4 and 5. I haven't cleaned the TB at all because I just recently bought the vehicle and the light has been on since I bought it and I also haven't checked the TPS either. I can mention that to the mechanic tomorrow and see if he checked any of that yet.
I honestly don't think it is the injectors either, but we are running out of ideas.
Thanks for the input guys.
2001 Volvo S40-Perrin MBC@ 11psi, EST intake, 35% tint, still slow
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