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After driving for a few miles, especially when it is feeling like it is bogging down, get out and feel of the wheel hubs. You might have a brake hanging up.
oil changes should be done about 2,000 miles(5,000 kil),tune-ups about 50-60,000 kil,tranny service about every 80,000kil,if you go to a library you should be able to get a book for your vehicle that will have service intervals in it that you can copy.
First thing i would change is your o2 sensor. you might take to autozone and let them check your codes that might tell you for sure what it is, This is a free service from autozone. Best of luck .
This is an electric shift transmission (4L60E). If the harness is not plugged in well enough or has dirt in the plug it can lose contact causing it to seem as if it is bogging. What is essentially happening is that it is starting out in 1st initially, but when you slow or stop it doesn't go into 1st again and tries to go in 2nd. You can go undewr the truck and check th connection. If this doesn't resolve the issue, I would return the truck to the repair shop and have them check to assure that the plugs are correct in the valve body driving the shift solenoids.
Fuel filter, plugged exhaust (even though you replaced the Cat), low compression, low fuel pressure, valve timing, MAP Sensor?
Seems like it's temperature related if you can go 15-20 to start with then only 3 after that...
2 things come to mind fuel filter and catalitic converter. One or both could be clogged.
Have someone push down on the gas petal while you feel how much exhaust is coming out the tail pipe.The farther they push down the more volume of exhaust you should feel.
I hope this helps you.
The fuel filter needs to be change every 30000 miles.
This seems like you have an emissions problem and could be many things from your oxygen sensors to your catalytic converters. If your truck is under one hundred thousand miles is should still be under warrenty and the dealership should replace for free
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