Have a 1999 4.3 chevy blazer. have replaced spark plugs, fuel filter, air filter, egr valve. engine runs fine gets satisfactory gas milage. My problem is the initial start. Engine rumbles upon on start-up. Like the whole engine shakes. Engine always starts and runs fine but the initial start is always rough. when you shut the engine off it does the same thing. Some times worse than other. Any suggestions why this is happening? More of an annoyance than anything.
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