5.2 magnum no power and random misfire after driving a few blocks.

[Banditlee23]

I have been having issues with my 98 ram 5.2. It feels like it has absolutely no power. always feels like i'm pulling a trailer up hill. it's driving me crazy. once in a while right after i start it up and drive down the road a little bit, it will bog and then backfire out of the intake, then it will run seemingly fine ( still without power ) it used to pop 02 sensor codes until i replaced both of them and changed plugs wires cap and rotor. also put in a new throttle positioning sensor. haven't had any codes since.... the motor was replaced 35 thousand miles ago with a brand new factory 5.2 ( dealer installed ) i did find a vacuum leak shortly after with a bad check valve but haven't found any since. but it hasn't had any power before or after it was blown...... anyone have any suggestions? i love my truck and don't want to give up on her yet. any suggestions would be appreciated. thanks

 

[Okiespaniel]

My first thought is miss routed plug wires, which is easy to do and won't always throw a code. Also, check your fuel injectors for proper wiring and loose connectors.

 

[Banditlee23]

do you know the firing order off hand and what would i be looking for as far as fuel connections? it burns gas like crazy so i don't know as if it's a fuel problem... new fuel pump too... thanks for the response so quickly

 

[emjohn4]

Check out this:

Warm Engine Sputter / Backfire - Dodge Durango Forum and Dodge Dakota Forums

Similar, if not same, problem I had on my Dakota. Did you replace the o2 sensors with Denso sensors?