Re: 96 Grand Marquis Eng.code P0300 ...
Well.. I got tired of spending time and money so,I bought a code scanner $78's and within 15 minute's I found the problem. Evidently,the person that had the car before me did a tune-up and didn't know what they were doin. Scanner kept ready misfire 2 & 4 So,after everything else I did..there was only one thing left..switched the two plug wires..SO I did.."RUN's LIKE A CHAMP !" Lesson learned always check the firing order and don't just put them back they way you found them. Could have saved a lot of money and head-ache. Now.. I sold the car..made a $600. profit and lookin for a new project. at least I got a new tool to play with out of all this :0)