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2003 Ford F-150 engine bucks at around 50 mph

Tiny
03FORD4X4
  • MEMBER
  • 2003 FORD F-150
Engine Mechanical problem
2003 Ford F150 V8 Four Wheel Drive Automatic

I have a 2003 F150 4x4 SCREW with a 4.6L and I need some help, this is what is going on. While driving everything is fine, when I start up hill and give it gas to maintain my speed or accelerate to pass, the truck starts to buck. That’s really the best way I can put it. I feel it most while driving around 50 mph and then going up hill. Some suggestions given to me are the IAC, throttle position sensor or mass air flow? It has not thrown a code and it starts and runs fine otherwise. It has a new air filter, new plugs (about 10000 miles) and it has 75000 miles on it. Help me please.
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Friday, January 30th, 2009 AT 7:20 PM

2 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Do u have a check engine light on
need to scan for codes
suspect coil wire
do a fuel pressure and volume test
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Friday, January 30th, 2009 AT 10:07 PM
Tiny
03FORD4X4
  • MEMBER
  • 2 POSTS
No check engine light, and the truck drives fine at this point. Just happens when going up hill, or accelerating up to speed. Once I let off the gas a little and maintain my speed it runs fine.
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Saturday, January 31st, 2009 AT 5:43 PM

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