86 And It Lags Of Power

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MY MOTOR IS A 7M-GE N/A IT RUNS GREAT ON THE HIGHWAY ,BUT WHEN YOUR ON THE ON A TRAFFIC LIGHT AND U GAS IT FEELS LIKE A HEAVY FEEL LIKE IT LAGS , AND THERE IS NO FAST ACCELARATION , ONCE ITS STARTS ROLLING IT STARTS PICKING UP . SOME TIMES OUT OF THE BLUE IT GETS THIS FAST ACCELARATION LIKE IT NORMALLY SHOULD BE , THEN IT LAGS IT AGAIN BUT YOU GUYS HAVE ANY IDEAS WHAT I MIGHT BE ,PLZ HELP ME, THANKS