When I turn the steering all the way to the left or right the truck shakes bad. I have replaced the power steering pump and idler arm. Any sugestions?

 

Is it felt throught the wheel or does the whole thing rock?

Is your 4wd off?

 

whole truck shudderes

 

Is the engine ready to cough and quit?

 

it boggs down and sounds like it is going to die as if it were under too much load

 

Hmmmm. It may be the fuel pressure regulator but that wouldn't explain why it drives ok straight.

 

Is iit in 4x4 or 2wd?

 

1999 LS 4WD

 

in 2wd, hardly ever get to put it in 4x4. I know I need to give it a decent tune up, you know O2 sensors, fuel filter, change belts, but these parts would have nothing to do with this problem as all of the above mentioned parts are not worn or damaged. In fact all my tune-up parts are not due to be changed fo another 3 months of driving.

 

See if it throws codes, I cannot diagnose the problem with symptoms you gave.