Ok will look last month it was still a bright white and its been checked by aamco and wheel works and it was good to go.

 

Usually places like Aamco will say it's good to go but it might need a changing. It's all about what you feel comfortable with and where you've driven in the past month.

 

City driving mainly will check it again.

 

Just checked the air filter and it was white with some dingy spots went ahead and swapped it out. dont know when it was changed last but put in the fram filter I had bought a couple months ago. If it's not the air filter any other suggestions?

 

Next would be replacing the TPS which is located on the driver side of the throttle body. Takes two T25 screws and make sure when replacing it you use the same gasket/O-ring it had in it before. When buying a new TPS it comes with both so just use the one it had when you removed it.

Make sure when replacing it you replace it in the same position as it was before, and you'll turn the TPS portion rather than the throttle linkage. Also be sure to reset the PCM after replacing it as if you don't it could race real high after you change it.

 

As for your ABS issue you need to get a cheap meter. Set it to AC V and check the ABS wheel speed sensors for voltage while spinning the wheel. Disconnect the WSS that you are ready to look at, hook up your meter between the two poles and start spinning the wheel. the faster the wheel turns the higher the voltage should rise. Jiggle the wireto the sensor. If any voltage drops out you have a bad connection and must replace the WSS. Repeat the process on the other WSS. If you have 4 wheel ABS you'll check all 4 corners. Once you are done plug the ABS connectors back in.

 

Replaced the air filter and same thing. And does the 98 have individual speed sensors for each wheel?

 

Probably just the rear wheels. You will see a wire going from the wheel if it has ABS.

 

the rear wheel abs sensor on these trucks is in the top of the rear differential for rwabs, and the 4wheel abs models have a sensor on each of the front wheels as well

 

I have been thinking that the cable on the rear wheel sensor may need to be replaced as I only swapped out the sensor and from my understanding is the only speed sensor outside of the one on the transmission.