Why do my truck idles so loud the first 2 minutes or so when i start driving?

1.let car sit overnight. 2. Start engine, put A/C on high, let it idle for 20-25 minutes, 2, then drive car uninterrupted for 60mph for 10 minutes, 3. slow down to 25 mph for 4 minutes, come to a complete stop with foot on brake let it idle for 2 minutes, 4. drive again at 30 mph for 8 minutes, come to a complete stop let it idle with foot on brake for 3 minutes. 4. Drive at 40 mph (turn off overdrive) for 6 minutes. 5. Drive at 20mph for 3 minutes at a time, each time coming to a complete stop with foot on brake for 2 minutes. Do this 4 times. Let the car cool overnight and repeat entire process. Then check status of systems with a code scanner.

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sounds like a loose accessory belt

I think you had better have a local shop inspect this for a failed engine connecting rod.

it could be that the one of the hydraulic valve lifters/cam followers are clogged try adding a oil change cleaner and follow the instructions on the can then change the oil /fiter

If the service light is on there is a problem. Take it to Auto Zone and have them read the code, they will do this for free hoping you will buy parts from them.

clean your map sensor first not reading air temp

Dear SIr,
As you saying noise wont come in driving and only comes in idle , it means noise will not come if RPM is high by norma in idle l, try this one start the car don't drive it just raise RPM(rotation per minute of only engine not vehicle speed) in neutral gear , if noise disappear that mean it a problem of drive belt . If drive belt is got less tension then also it can occur or belt is damage, replace belt problem will solve, (for reference drive belt it drive alternator,powersteering pump,A/C compressor that is made by rubber).Thanks if any problem ask me.
Yogesh.

ok..you must have more than one car???? you don't drive the 300 atall im guessing. #1 start car drive up the road and \back to your house. #2 let it idle till problem starts. #3 once it does start with the problem keep it alive with the gas pedal. #4 once your have it safely from dying in higher rpms "rev it" like a kid would, you know like if you were gonna race some one lol. be careful not to over rev or damage engine. you should do this for five minutes no longer than that. #5 let it idle for another 5 minutes. #6 repeat every day until problem with idling decipates. it took mine 3 300e like 3 days of this. if your not going to drive the car once you get the problem out of the way. turn the car on everyday and let it idle for 5 minutes atleast and take it for a short drive once a week. they get lonelly you know lol. later on you can just turn the car on every 2 -3 days and let it idle but still take it on a short drive atleast once a week

You need to take the car back to the place that did the exhaust work. What you are hearing is the exhaust system (pipe, muffler, etc.) touching the underside of the car. The exhaust system is mounted along the underside of the car with exhaust hangers (usually made of rubber) also called insulators. The reason you don't hear it when going is because when you step on the gas the engine torques causing the exhaust system to move away from what it is touching.

Check the Fuel Pump and Fuel Filter. Sounds like 1 Or Both are Bad.