No urgent thing here. Just wondering if anybody knows what I should look for to solve this problem.. When I first depress the gas pedal, my 99 Jimmy 4.3L (same truck actually as a 99 blazer) hesitates and bogs for a few seconds b-4 it kicks in and accelerates. It started doing this about a year ago. So far what I have done to try to fix this is replace plugs and plug wires, replace pcv valve, replace distributor cap and rotor, look around for vacuum leaks, air filter, fuel filter and ran fuel cleaner in the tank a couple times. Had the truck since it was almost new back in 2000. I always changed the fluids and filters more often then required. Thanks