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No power when throttle down, sputtering

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Hey there!


My 90' K1500 350 TBI has suddenly been acting up when you go to give it gas or put it under load as in going up a hill. It just loses a lot of power and sputters around.

My first thought was fuel pump. It is idling fine. It has been having a slower or prolonged crank to start. It was running smooth until I took it for a new set of tires (go figure). 

I pulled the codes and got 32, 43, & 44. 

I unplugged the ERG line and saw no difference in performance. 

My next planned steps are to test the fuel pressure and maybe replace the MAP sensor.  

Any other tips tricks or other things I can try b4 I start ordering up replacement parts and praying?

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Grabbed a new fuel filter as it still had the original filter. Went to change it out because I was hooking up the fuel pressure gauge anyway. She started right up and ran like a champ. Nice gunky junk came out of the old filter. 

A couple days before it started acting up I filled up the tank to 3/4ths full on a 40 gallon tank. It had been kept low of most of its life as a farm truck. Im guessing it stirred things up and clogged it right up.

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