1997 Chevy Suburban CAR SHAKES WHILE DRIVING

OK SOMETHING LIKE THIS WAS HAPPENING TO ME AND IT WAS THE SPARK PLUGS OR JUST ONE SPARK PLUG THE SERVICE ENGINE LIGHT TURNS ON BECAUSE ITS SENDING A CODE TO YOUR COMPUTER USALLY TELLS YOU WHAT SPARK PLUG IT IS BY NUMBER LIKE #7 OR #5 WHAT YOU CAN DO IS 2 THINGS YOU COULD GO TO LIKE PEPBOYS FOR FREE DIAGNOSTICS TEST THEY WILL GIVE YOU A CODE AND THEN YOU FIND OUT WHAT IT IS OR 2 AT NIGHT WHEN EVERYTHING IS DARK OPEN YOUR HOOD TURN ON YOUR TRUCK AND LOOK AT EACH SPARK PLUG OR FOLLOW YOUR SPARK PLUG WIRES YOU WOULD BE LOOKING FOR A ELECTRIC SPARK THE BAD SPARK PLUG WOULD BE LIGHTING UP AND YOU WILL ALSO HEAR A CLICKING SOUND REPLACE IT AND THAT SHOULD DO IT THIS HAPPEND TO ME AND THE SPARK PLUGS WERE BRAND NEW I JUST REPLACED IT SAVE YOUR SELF SOME MONEY AND TRY DOING IT YOURSELF FIRST IF ALL FAILS THEN SPEND THE MONEY. HOPE I COULD HELP.