Ok, I have read every post on moosing and cannot find out what is wrong with my 2.5l mtx, when the car is run hard, the intake starts screaming, rpm and speed remain constant, but move very slow, clutch is fine, i do have a broken (but functional) tensioner, the car just accelerates slowly after 3300 rpm, and is fine before the valves kick in, could this be the IAC? Please help.
That sounds like the culprit. It should be an easy change out as you could do it yourself. However, get your car diagnosed to make sure that:
1. It is the culprit
2. There isn't anything else causing the problem.
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