Why would a 93' skylark stumble on acceleration also stumble when gas in pressed in park Engine shakes and stumbles?

I fixed it. I found that there was wrong size spark plugs in it. I bought the car this way. I replaced them and it runs good. Try replacing the fuel filter. My 1993 Buick Skylark was doing that and it seemed to help. Also run some good fuel injection cleaner through it next time you fill up.