Wanted to see what you guys maybe think my issue is...Here is a run down of my truck 05 5.4L Screw has 130K on it. Sometime when going up a slight incline the truck at partial throttle will shake very very little. if I put my foot into it the shake goes away and the truck response just fine. It only does this when going uphill on the freeway and on the streets here in Dallas that have slight inclines.

The truck is not throwing any codes nor does it stall at lights. Starts right up in the morning and runs good. Nothing done to the truck except I have an Edge programmer and Magnaflow exhaust. I have pulled the programmer off and returned the truck to stock and it still does the same thing.

I bought the truck used in 07 had 40K miles on it. I'm thinking spark plugs or maybe a coil is going bad. But this doesn't happen all the time just here and there.

Thanks

 

I'd guess water in you fuel tank.

 

I had an occassional similar problem that went away once the plugs were changed (@98k). How many miles on your current plugs?

 

Have U put in the new numbered spark plugs, they seem to cure a lot of troubles.

 

i changed the plugs. turned out to be #4 and 8 plugs.

 

is their a specific part#? And any place to find these plugs cheaper local autozone has them priced at $12-13 a plug!!! Thanks

 

Motorcraft SP-515's. If you have an Advanced auto parts near you use code P20 for a 20% discount on all orders placed online (with restrictions), and just pick them up in the store.

$12 becomes $9.60 real quick

 

Bought some in January and March for $8 each at O'Reilly's. However, today they were $12.99. So, seems that's the going price. My dealer was selling at $15 each withe a "retail" of $25.