i have a 91 toyto camery in the the morning it runs fair but in the evening not so good it sputers and bogs down but when i let off the gas it will smooth out also when i turn it off i got to wait 5 minute before it will start back anybody got any ideas please help

If the routine maintenance hasn’t been done, that needs to be done, first. Doing it may, even, be a fix! Change the spark plugs (and wires if they are very old), distributor cap and rotor, fuel filter, air filter, pcv valve.