Cant Wont Accelerate past 3000rpms

[caliplaya650]

Here are some of the exact symptoms:
1)The car has good pick up b4 2500 rpm On the punch
2)Once i hit 40+mph the car has no more punch.
3)2500-3000 the car surges,hesitates to go, and gives a put put. Any ideas?

When i installed the headers and tb. the only cables i disconnected where the
airflow sensor/
Idle control unit/
the cable on the tb. that has 3 pins/
and the negative battery cable.

Any ideas yet? I was wondering if when i installed the headers if they didnt sit properly and had a opening and air was getting in could it mess up the o2 sensor reading????
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1992 Mustang 5.0
BBK cold air intake
Dual Flows w/ H Pipe
BBK Underdrive Pulleys
BBK 65mm Throttle Body

[This message has been edited by caliplaya650 (edited 08-27-2001).]

[This message has been edited by caliplaya650 (edited 08-27-2001).]