I'm working on a 99 dodge ram 1500 and it has a strange problem. It runs and drives ok for about the first 50 miles .Then after that it starts to bog down and doesnt want to run correct. Does anyone have any ideas or has anyone run into this in the past. fuel pressure stays about 53psi the whole time.

thanks

 

does it fail to rev up beyond a certain point -> clogged cat.