code PO307

[watercop56]

I have a 2003 Maruader and I keep having a reocurring code that says I have a misfire on number 7 cylinder. I have recently put new plugs in car and I cannot detect a misfire while driving. I can drive the car several hundred miles before the code comes on again after I erase it. Also, a code sometimes says. detects a misfire below 1000 rpms. My Maruader only idles about 500 -600 rpm while in drive. Is this normal? My car has about 69,000 miles. Does anyone have any suggestions?

[MM2004]

I have a 2003 Maruader and I keep having a reocurring code that says I have a misfire on number 7 cylinder. I have recently put new plugs in car and I cannot detect a misfire while driving. I can drive the car several hundred miles before the code comes on again after I erase it. Also, a code sometimes says. detects a misfire below 1000 rpms. My Maruader only idles about 500 -600 rpm while in drive. Is this normal? My car has about 69,000 miles. Does anyone have any suggestions?

Try swapping the #7 COP with one of the other cylinders and see if the problem follows?

Your idle speed is about right for stock.

Mike.

ps. Welcome to the site! I am in Louisville.