Hello everyone,

I am in need of some major help, the truck is a 98 1500 with the ever so powerful 3.9. The truck itself has close to 130k miles on it, while the engine has only close to 50k miles on it. The original motor had to be swapped out due to a spun bearing; that was over a year ago. Up until recently the truck has been running great, no issues, and has even made a cross country trip from Michigan out Oregon, mountains and all, with no tantrums. The donor motor had new plugs and wires installed for the record.

Recently it has been acting up, where it will bog down, and misfires under load. When this happen, the routine would be to pull over, inspect the truck, turn it off and restart it and it would be back to its regular self. Now the tantrums are becoming more frequent, and in some cases the truck is becoming hard to start or may need a little gas to keep it running.

Other symptoms; not that the thing had great gas millage to begin with, but it has been decreasing, but so have the temperatures out here(running richer?), some cases it seems like the little motor has lost some of its performance, particularly under hard acceleration and up inclines.

I am concerned that it maybe a bad catalytic converter or failing fuel pump, neither of witch are cheap, or easy to do for someone with limited resources.

Any and all help is much appreciated.

 

https://dodgeforum.com/forum/2nd-gen...um-thread.html

Pull the upstream 02 sensor and see if that helps the problem. If so probably the plenum, if you are under monetary constraints trying seeing if a shop will chop out your cat for you.