Mechanics

MY TRUCK WILL NOT ACCELERATE CORRECTY AND LOSES ABILITY TO ACCELERATE AT ALL ONCE HITTING 45 MPH. ANY IDEA WAS WHAT TO COULD BE WRONG?

1999 Ford F-150

I drive a 1999 Ford F150. I have been having this problem lately where my truck won't accelerate like it should. It feels like it is missing. Also once I hit 45mph in my truck, I lose all ability to accelerate and have to let it drop down to 25 mph or below before I can accelerate again. My dad thought it might be a spark plug issue but after replacing the spark plug, the problem is still persistent.
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Dblevins93
July 21, 2012.



Start with a fuel pressure check. Spark would be next and then compression.

Bad cat converter would also cause the issue

Roy

ASEMaster6371
Jul 21, 2012.