: Check engine light



csbeard
02-09-05, 09:57 PM
1998 Cadillac DeVille Northstar.

Check engine light came on today while driving.
I checked codes and came up with PO300 (Engine misfire detected)

Before I take it to the shop, is their anything I can do.

Like fule injection cleaner in the fule tank??

Thanks
CSBeard

Ranger
02-10-05, 06:21 PM
Change wires and/or plugs. Stick with OEM.