I have a 1999 Chevy Tahoe that hesitates bad sometimes when you accelerate hard as soon as it gets warm. When it’s cold it runs great. I have changed plugs, wires, distributor cap and rotor button about 6 months ago as well as the fuel filter this week. But it is now getting terrible gas mileage. Maybe 200 miles to a tank which is a 21 gallon tank. The truck is regularly maintenance and i run 93 non ethanol gas. Fuel pump was change about year and a half ago that was my next step. The truck is straight piped and tuned with the cats tuned out. The only engine codes it gave me were all 3 oxygen sensors and eventually it went away and engine light hasn’t came back on. Any input would be great. I was leaning towards ordering an msd distributor Kit or another fuel pump.