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When driving engine feels like it downshifted and loses

Customer Question
When driving engine feels...

When driving engine feels like it downshifted and loses power. Noticed it has a negative advance spark reading every time it happens

Mechanic's Assistant: Is the power loss consistent, or does it fluctuate?

It happens at different speeds

Mechanic's Assistant: What is the model/year of your Ford?

2004 f150 5.4 triton

Mechanic's Assistant: Are you fixing your F150 yourself? What have you tried so far?

I have repaired the timing chain gaurds and replaced all coil packs and spark plugs

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Fixing myself

Submitted: 11 months ago.Category: Ford
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Answered in 5 hours by:
9/20/2017
Ford Mechanic: Chris (aka- Moose), Technician replied 11 months ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
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Any warning lights on?

Feels like it down shifted, can you downshift from 4th to 3rd to 2nd to 1st manually to see if what you are feeling is actually a downshift?

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Customer reply replied 10 months ago
The truck is an automatic transmission
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