Kevin_MacArthur

I have this problem when I'm in the low rpm's, most noticeable at 55-63 mph and 1500-1800 rpm, where the entire truck shudders, this is after it vibrates for a little bit. I've been giving it more gas to downshift before it happens because it can't be good for the truck. This morning the engine check light was blinking as I was Trying to accelerate on to the freeway and went away shortly after without showing any codes. I did a quick search but didn't find anything similar except in the 2009+ models--also only have a phone so I can't do the most detailed searches.

.45fats

COP went bad. should have the number stored in the system. had EXACTLY what you're describing and the #1 went followed by the 3 and the 8 about 6 months later on each

Kevin_MacArthur

I'll take it to autozone tonight and see about getting the codes. Thanks man.

Kevin_MacArthur

All they said was that the engine was running lean.

otto457

No actual codes? If it was one bank lean and the other not is different than both banks lean. If you have an aftermarket intake that may be one issue, the more likely is the MAF and TB need cleaning.

Kevin_MacArthur

Both banks lean

lariatboy

Fpdm.

Kevin_MacArthur

update-- took it to a shop to get a tune up and he said it was throwing transmission code p1780, took it to the tranny shop and they said the Torque Converter and clutch were broken. Took it to another tranny shop for a second opinion and they said the tranny was fine, they got engine codes for a intake manifold runner control fault stuck open/close as well as both banks running lean.

as for the fuel pump control module, I checked that first and it was a-ok.

still no check engine lights.
problem is starting to show itself when OD is off as well.