Need help - Slow starts, misfire codes on 2004 5.7 hemi
I need some help troubleshooting multi cylinder misfire alarms and slow starts on a 2004 Ram 1500, 5.7 hemi, 44,000. Here are some details: Historically, truck cranks for a few seconds before firing up (typicaly between 2 - 5 seconds), changed to platinum plugs at 30,000. Misfire codes have been intermitent, multicylinder and sometime individual cylinders. The eng light appears to come in immediately after the engine fires up after a slow start. I have observed no rough idle or rough engine performance at highway speeds and MPG is as expected 15.5 for short trip driving and 21 or slightly higher for continuous highway driving. I ran 4 cans of Seaform through the fuel system to ensure it was clean with no apparent affect. Dealer cleaned engine carbon with a spray cleaner and updated flash menory which did not resolve problem. I am thinking the misfiring is during the slow starts. Any help to focus my troubleshooting in the right would be appreciated.