Pontiac Other

Pontiac Trans Am 1979 150,000 miles 6.6 L 403 olds engine. I need to know what is going on. My car when I start it up will idle fine in park or nething but once my car goes into gear (its an automatic) so once I put it in reverse or drive and let off the brake it dies. Unless I put the gas ALL THE WAY to the floor. If I put the gas to the floor the car starts moving and runs. Until I let up on the gas to much and then it dies. PLEASE HELP ME. Im thinking a carb. Problem. Maybe the idle is set to low I d k lemme kno plz
May 6, 2007.

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