Chevy Silverado 350 small block 1990

Asked by Oct 24, 2016 at 04:02 PM about the 1990 Chevrolet C/K 1500 Standard Cab SB

Question type: Maintenance & Repair

Truck hiccups while driving usually once rpms
have leveled out I have changed plugs wires cap
rotor fuel filter and air filter I even tried drilling a
1/2 inch hone in catalytic converter to check for
carbon issues I am at loss I also put in sea foam
please help this truck is my favorite

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