97 chevy 1500 350 vortec high rpm slower acceleration

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I am having intermittent acceleration loss.



No funny sounds shutters etc.



Simple sometimes though getting more frequent when I floor it I get 4-5 range rpm but slow acceleration.



I had the transmission serviced and nothing was said.



It also accelerates fine from stop up to highway speed, only highway and over such as passing or gonig up hill that the issue starts.



I have been told it could either be the brake switch giving a faulty signal or the tps. Maybe torque converter?



Can someone help me.



I am hoping it isn't the transmission but at this point just want a clear answer.



After getting my transmission serviced and while I was accelerating the brake faulty voltage error came on on the way home if that helps.
 

Schurkey

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What is the fuel pressure when the acceleration is poor? How old is the fuel filter?

Connect a scan tool, verify EVERY sensor and computer output...but check fuel pressure first.
 
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