I have a 04 1500 4x4 Auto. I've been having SEVERAL problems, TB replaced due to failure, constant misfires, sensors going bad. And over the last 3 months have put about 3000 into new parts. Now, It seems the only problem is code P0300 Random Multiple Misfire. But I can clear it daily and it will not come back until the next day. (including driving, starting, stopping, cooling, restarting) The only physical display of a problem is at 55mph, the slightest acceleration or change in grade in the road will cause a MASSIVE shudder through the pedal, which if held shuddering long enough will backfire, but will go away if given enough gas (Downshift). I can reproduce this problem at will, but only at 55 mph. Any questions? Helpful tips? Anything? Greatly appreciated.
-Josh