My truck is throwing a PO300 code. The check engine light blinks at about 2500 RPM. After running interstate for awhile the light comes on steady.
The dealer replaced the MAP sensor---problem still there. Replaced the spark plugs-they said the wrong ones were installed---problem still there. They did a leak down test and said it was carbon build up on the valves---wrong still there. Over $2000 and the dealer will get the truck back again this week and we will talk when they get it back.
Anybody have any ideas as to the problem