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New mustang owner... Big time DIY'er. At start up, engine runs fine, nice power. After about 15 - 20 minutes of normal driving, major power loss can be felt 2k rpm+. Also, only when this happens, you hear a sound very similar to a fan blowing high (haven't had the chance to find out what the sound is). Assuming it could be the fuel filter, but what's with the sound? Would hate to have a mechanic charge $100 for a $20 job.
 

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Many things could be causing a loss of power, im thinking it is overheating, the raise in temps will make the EEC back up the timing.

Things to check:

1. Radiator, coolant, thermostat, fan
2. Intake air charge temp sensor.
3. Has an exposed K&N installed? if the filter is exposed to engine heat, this will make the car run bad.
4. Dirty MAF
5. Bad fuel pump or cloghed injectors, check fuel pressure when COLD and HOT.
6. Scan the EEC for codes.
 
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