When I accelerate it feels like I'm not pressing the gas and I'm towing a circus of elephants. The top speed is 20-30 MPH and that's pushing it. It feels like I have the choke on and it holding it back.

Yesterday it ran perfect (except that I have a 2 chamber FlowMaster on it and I could hear it, almost as if it was there) but today when I started it it get the pachyderm special holding me back with no power.

It does idol rougher now? Could it be the fuel pump (never changed).

It feels like there is a banana in my tailpipe.

Any ideas?

1999 Ram Sport 4x4
5.9L
Quad Cab

I just took it out and hit 15 MPH, floored it and the RPM only went to 2500 and it never shifted gears. I got up to 22 MPH before it started "jerking" forward and backwards.

 

Sounds a lot like a clogged cat. Check into that if you haven't already.

 

Or a bad 02 sensor.

 

Cat is going out. I never had that sudden of a change and i could still hit 45 after a long slow strectch but Id imagine a clogged cat can happen many different time frames

 

Unscrew the pre-cat O2 sensor and strap it up out of the way so it wont get damaged and take the truck for a short test drive with the open O2 sensor hole. Yes, it will be louder, but if it runs much better, you'll know that you've got some exhaust blockage, most likely the cat. Dont drive it for long like this, this isn't a "fix".

-JT

 

Sounds alot like a clogged cat I just had this problem with mine. The easiest way I could tell was by holding my hand behind the exhaust if it is barely coming out and not like it should be then its clogged. I tried unplugging the o2 sensor on mine and it did not run any different. And yes mine did this over night as well drove just fine one day next day would not get above certain rpm. although with a long enough stretch it would gain speed up to about 50.

 

100% clogged cat, had the exact same problem this week.