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Discussion Starter · #1 ·
My 03 SEL with the tec (52k miles) has seemed to develop a hesitation/bucking when I'm driving between 30-40 mph and give it about 1/2 throttle.
The car bucks and hesitates, but never stalls.
It happens about 1/2 the time in this situation.
I hoping its not the transmission (changed out the fluid at 30K) as the car seems to shift normally.

I've cleaned the MAF but have not done anything else.

Could it be the fuel filter (never changed) or what do you think??
Thank you in advance!! :)
 

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How do the wires and coil pack look?
 

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Start simple. Try changing the fuel filter. I change mine every 15,000 miles. I believe the basic recommendation is every 30,000.
 

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Discussion Starter · #6 ·
No codes.
Is any fuel filter OK or should I get a motorcraft one?
 

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^ Hes got a tec. I would use any parts store brand. Dont think the mc would matter here or be worth the diff. in price. An ignition misfire light may rear its ugly head later.
 

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same hesitation problem 2003 DOHC

I have the same hesitation problem. I,ve changed plugs, spark plug wires , new coil pack ,cleaned the IAC, replaced lines and rubber fittings from pcv valve and the oil breather lines from the valve covers, checked the fuel filter and still haven't found the problem. is there something else? it does this intermittently and never throws any codes.
 
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