2000 Ford F-150 Pick-up Hesitating - Engine


Question: I have a 4.2 V6. When driving over 35mph the engine lurches trying to maintain a steady speed. It's usually fine after a cold start until it warms up. I thought it was the transmission slipping, because it was a sudden lurching almost, but it checked out okay. It does a little better when I turn off the O/D. When idling at a signal it struggles and almost sounds like it's about it stall. If I take it out of drive into P or N it settles down; otherwise the whole vehicle shudders with the engine. I just replaced the air filter and used one of those fuel system treatments, but I think I bought snake oil.

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Owner: Actually has trouble when it's cold as well.
Technican: Does the service/check engine light come with the engine running?
Technican: Missed a word... does the light come ^ON^ with the engine running?
Owner: Yeah, the "Service Engine Soon" light does come on.
Technican: Go to Autozone (other stores may offer this service) and they will check the troublecodes free of charge.
Owner: I took it to AutoZone and the diagnostic came back that cylinders 1 and 6 were missfiring. I'm just over 75, 000 miles by the way.
Technican: New spark plugs and plug wires should be installed. Pay close attention to the old plugs and wires for the offending cylinders. Replace plug wires one at a time to avoid confusion. Also inspect the coil towers for any corrosion.

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