American brands like GM are the best v8 autos on the planet for the money. Toyota does not even offer anything that compares.I agree with mark.. Fuel sucking hog.. I did fuel pump, knock sensors/harness, a couple other sensors, TWO GIAGE CLUSTERS!!!, heater module and motor, ect,ect... The reality is that most of us with these problems have around 2003 trucks.. Which are now 10 years old.. I work on oilfield truck for a living and see the same shit over and over with electronic component failures.. I guess if you really don't want to deal with these problems, you could always buy a pedal bike? But for most of us.. We work to pay for our vehicles..
The catalytic converter was a bad gov regulation and most likely source of your engine knock. I like to take the catalytic converter and punch it hollow for an increase in power and fuel economy.(replace that fuel censor while at it!)