1991 Chevy K1500 hesitation

chevrolet
1500

#1

I just bought a 1991 K1500 Chevy truck and it seems to have a hesitation when you are cruising along and give it a little gas. It happens more when climbing a slight hill, if you give it a little more gas it clears up or you let off the accelerator it clears up. I changed the plugs, wires, oxygen sensor and pcv valve, still acts like it misses.