I have a 1994 dodge ram 1500 truck 4- wheel drive with the 5.9 liter motor 165689 miles on it.

Question

i have replaced the fuel pump, the o2 sensor, spark plugs, plug wires, coil, distributor. once you get up to around 55 m.p.h. and motor levels off it sputters and shakes the whole truck what is causing this. please help i have a boy scout trip to go on and they are depending my truck to pull the canoes.

Answer 1

have you ran a computer scan on it to see if it has any trouble codes on it,that would be a good idea to do that and the have the fuel pressure checked on it,it sounds like it may be loosing fuel pressure,check the pressure on it ,if the filter is getting stopped up that will cause that too happen,or the pump going bad either one will cause it,without having it checked though all anyone can do is guess at it,good luck with it.

Answer 2

Look in the manual to see how to read the trouble codes. I have the same truck at about the same mileage, but never had this issue. Have you checked the TPS?  

Answer 3

Have the catalytic converter checked out for blockage.

Answer 4

Unhook the exhaust, foward of the catalytic converter and recheck.

Yours is a prime candidate for a plugged cat.

I bet there is a lot of intake noise to go along with your performance problem.

Chances are the cat and exhaust pipe are crimped together under the clamp, you will need a torch and a BFH to get them apart.

You could also remove the O2 sensor and recheck, but the difference will be not so easy to feel.

If you just want to go for it; cut the exhaust and have it welded back together if needed. It's a lot easier and won't cost a lot at any muffler/exhaust shop.

Answer 5

Check the exhaust it may be defective>Plugged>With that many miles on her>