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either drive train or engine compression , get the cylinder compressions checked as the easiest place to start , if ok check for the air intake and vacuum systems and then the drive train good luck
Easy fix my friend. It's a bad EGR valve causing this. That's an Exhaust Gas Recirculation valve and part of emission control that nobody ever thinks about. It's bolted onto the head near the back and has a small vacuum line running to it. Replace it and you'll have all the power the engine will give not just on flats but on grades and hills also.
an automatic trans will not shift into overdrive if the motor is under loads such as hills, or general acceleration. you will probably feel it kicking in as you slightly release the gas pedal on level ground.
It will shift out of overdrive upon increasing throttle , pulling hills and so on. Your overdrive probably kicks in around 35 to 45mph and kicks back out as you increase throttle. Electrically controled speed sensor to control the response. Overwise the engine would bog down to a stall. Over drive is just that. It changes the gearing ratio to over drive meaning less then final gear 4 to 1 down to 4 to 3 etc more direct drive ratio to lessen consumtion of fuel with less stress on engine. Have shift speed sensor adjusted. Don't drive in overdrive in city if most driving is under 45mph
The transmission is this truck is a 4L60E. It is electronicly controled through several sensors. It will sense the load on the motor mainly through the TPS (throttle position sensor).It is not uncommon for you to have to really press the gas to make it down shift. Alot of the feeling depends on gear ratio in the rear end. The 4.3 is a very good engine, but it combined with a high gear rear end and overdrive may really seem under powered. You can put a programmer on it to change all the shift and power feel.If you are not having a hesitation issue then it will most likley not be the tps. You may just need a fuel and air filter, not knowing when it was last changed. The programmer is the best way to get the feeling you may be used to. Good Luck
20 year old vacuum hoses are done. Replace all you can. The little plastic ones too. They control everything, transmission, computer, fuel, brakes, everything.
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