transmission problem

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Oct 20, 2014 | 07:21 PM

85MD

Thread Starter

Freshman User

Joined: Feb 2010

Posts: 34

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transmission problem

I am not sure what the problem is, but here goes the best explanation I can manage. When driving the truck at say about 30-40 mph, and just barely pushing on the gas, the truck will jerk almost as if the transmission is trying to switch back and forth from OD to the lower gear. If I disengage the OD, rpms go up and it stops. If I reengage the OD, it starts again. If I accelerate, it doesn't happen. It doesn't happen at low speeds or higher speeds than about 45 or so (from my recollection). So lets say I get up to about 35-40 mph, stop pushing the gas, then ever so slightly push the gas, it starts again. This problem is relatively new, starting months ago. By the way, I have a 2004 F150 Lariat 4x4 triton 5.4 towing package
thanks for the help..
Paul

Oct 20, 2014 | 09:21 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,730

Likes: 2,658

From: SE Florida

It is almost certainly a bad ignition coil. I've fixed many of these with identical symptoms.

Oct 21, 2014 | 08:39 AM

70f100longbed

Fleet Mechanic

Joined: Aug 2002

Posts: 1,899

Likes: 29

From: Raleigh USA

Its either a coil or a plug with carbon tracks. Find out which cylinder it is and replace the coil and plug on that cylinder then replace the rest of the plugs and coil boots.