u/08___SS

Got a 1995 Mustang GT 5.0 auto. Ran fine yesterday, parked it for a little, once I started it back up it was shaking and shakes on the gas. Sometimes smooths out a little and then when I let off the gas it shakes pretty hard again. Sometimes putting it in reverse from park the rpm’s will drop LOW and the bounce back up. Think I’m trying to narrow down between a vacuum leak or ignition issue . Went a head did distributor cap and rotor and new ignition coil to get those out of the question. What do y’all think with those symptoms? Like I said it was fine when parked not even an hour before it started doing it.