my 98 5.2 was idling rough then at low rpms it would hessitate backfire through the throtlebody i got 2 codes both 02 sensors max volts I replaced them fixed it for 50 miles then same codes so I replaced the tps,both 02's,iac,map 50 miles later same problem any ideas

 

Sounds like you have an ignition problem, if it is backfiring, the o2's will read rich due to cylinders missing. You could have anything from a coil, bad ground to just needing a tune up

 

thanks it could be the coil or pickup module or crank sensor the truck has a accell hp coil the problem is intermitant and at low idle