1997 Pontiac Grand Prix GTP Q&A

1997 Pontiac Grand Prix GTP Question: How to pin point misfiring cause. ..

P0300 and p0301 keep popping up and my engine shakes bad at 10 or less mph I have changed spark plugs and wires no help im not sure if my ignition controller is bad or what it just happend last week I even changed the egr and thermastat no clue and I dont think vacuum leak. .. any ideas. .. -
Answer 1
GET PROPER DIAG IT COULD BE COIL ISSUE -