Engine has low power takes time to speed up especially in 3rd gear. Bogs down when going hills

Asked by Mar 02, 2017 at 10:20 AM about the 1989 GMC Sierra C/K 2500

Question type: Maintenance & Repair

Engine bogs down all the time and stalls
occasionally. It has low power, it shifts well but
speeds up slowly. When going up a hill it slows
down even with gas pedel pushed all the way in.  
And i have to put into second gear juat to get up
the hill. I bought spark plugs, wires, distributor cap
and rotor will that help?. 350 v8 5.7

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