What is causing yo 1990 Chevy Silverado 3500 to buck at cruising speed
robert1987
Member Posts: 1
I have changed the ERG, fuel pump, distributor and cap, plugs and wires, mass air flow sesnsor, coolant sensor already and nothing fixes it.
0
robert1987
Member Posts: 1
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Answers
Disconnect the vacuum hose and see if it is wet with fuel or smells of fuel.
If it is, the diaphragm is blown.
That is assuming, of course, that all of the ignition (timing, etc) and fuel filter have been checked or replaced.