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I have a 2005 f150 and runs well except between 45 and 55 mph. The truck begins to hesitate and then smoothes out. Not sure if the engine needs a tune up or if I have to have the transmission checked out. Please help. Thanx.

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  • 310 Answers

Is it a diesel truck.?
if yes check your glooing plugs.
keep the plug at same hole where you screw it out.
the tip of the plug is positif and side is negatif.
take a good wire and clip it on the side.
hold the tip (where the connection wire sits) to the possitif,
from the batterie.and the wire on the negatif from the batt.
good plug start to glow from top stift and glows then further,
to the tip .bad plug start to glow in the middle.
be carefull these test the plug gets very hot.
and burn your skin to the bone if you touch it.
do the test only few seconds.
els you can check all filters.
see if airfiletr case dont have stand for winter and summer.

Posted on Oct 18, 2013

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Posted on Jan 02, 2017

  • 59 Answers

SOURCE: transmission stuck in forth gear check engine light is on.

Your TCU (transmission Control Unit) is bad. it is located behind the passenger side kick panel. you can purchase it on ebay for about 79.00 with exchange.

Lugnut61

Posted on Feb 10, 2009

  • 195 Answers

SOURCE: Hesitation / missing / car shakes

Hello;
The problem is most likely break down of the spark plug wires. The demands on the spark during acceleration and load destroy the wires as they age. I would start there. Hope this helps.
Thanks;
Rich
RPM Northwest

Posted on Jan 28, 2009

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