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My father in law had the same problem on his 2004. He noticeably had a bad camshaft position sensor. You can remove it and check if the what I believe is a magnet has fallen apart. As mentioned before save your money and get it diagnosed before replacing parts. Can't be sure but it's probably not the computer.
Have you checked rockauto.com? As G.T. Service Center said you can get the whole assembly. If you get the whole assembly it will take less time to replace and you won't need a spring compressor.
If you believe the fuel injector is bad you can unplug one connector at a time from each injector. If there is a change in the idle or it runs worse/rough the injector you unplugged is a good injector. Plug each injector back in after checking it. If you have a bad injector the engine will not change idle when unplugged. Of coarse the engine must be on when checking these.
This is a low coolant warning indicator that you describe. Check your coolant level.
Im 99.9% sure there is rust built up between you spindle and speed sensor on the front wheels. You will need to remove the speed sensors and clean the rust off. If you have access to an OBDII computer you can check which sensor is at fault. There is a recall that covers some of these trucks where they will clean off the spindles and replace the sensors if necessary. It is very unlikely you will be able to remove the sensors without breaking them. I myself bought the sensors then performed the repair. Good thing since the sensors feel apart.
You are absolutly correct. There is a short in the electrical system. Start be checking the battery terminals for corrosion or loose. It's lickly related to your battery or alternator. If you feel motivated remove them and have them checked. I'm not sure where else you can go to have this done for free but Firestone perfoms an electrical system check on the battery when you get your oil changed. This is done at no charge.
The wires should have a connector at the end of them. If there is no connector a wiring repair is necessary. If there is a connector still attached you can simply plug it back in. Take a look behind the mirror and you will see a hole in which the connector inserts.
remove the connector and slide a socket over the end of the sensor. attach an extension to get you away from the engine so you can turn you ratchet.
it getting louder when you turn the steering wheel leads me to belive there is a propblem with you power steering system. Start by checking the power steering fluid level. If you don't know how to do this you can simply read your owners manual or take it to a parts store such as autozone and they would happily check it for you. You can also take it to the shop you get your oil changed at and request that they check it. If they want to keep your business they will check it and top it off for no fee. Most places will check and top it off during an oil change.
There are several reasons why the jo may need to be done but here are a couple. Poor parts may have been used to make the repair and they failed alreay. The job was'nt done properly such as torqing the bolts or adding enough sealer where there is no gasket material.